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  • 51.
    Rudner, Mary
    et al.
    Linköpings universitet, Institutet för handikappvetenskap (IHV). Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Orfanidou, Eleni
    University of Crete, Department of Psychology.
    Capek, Sheryl M.
    University of Manchester.
    Andin, Josefine
    Linköpings universitet, Institutet för handikappvetenskap (IHV). Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Karlsson, Thomas
    Linköpings universitet, Institutet för handikappvetenskap (IHV). Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Dahlström, Örjan
    Linköpings universitet, Institutet för handikappvetenskap (IHV). Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Kästner, Lena
    Ruhr-University, Bochum.
    Cardin, Velia
    University College London, Department of Cognitive, Perceptual and Brain Sciences.
    Fransson, Peter
    Karolinska University Hospital, Stockholm, Sweden.
    Ingvar, Martin
    Karolinska University Hospital, Stockholm, Sweden.
    Johnsrude, Ingrid
    Linköpings universitet, Institutet för handikappvetenskap (IHV). Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Woll, Benice
    University College London, Cognitive, Perceptual and Brain Sciences.
    Rönnberg, Jerker
    Linköpings universitet, Institutet för handikappvetenskap (IHV). Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Sign Language phonology and its role in neurocognition2011Konferansepaper (Annet vitenskapelig)
  • 52. Salander, P.
    et al.
    Karlsson, Thomas
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för beteendevetenskap, Avdelningen för kognition, utveckling och handikapp, CDD.
    Bergenheim, A.T.
    Henriksson, R.
    Comment on Weitzner and Meyers1998Inngår i: Psycho-Oncology, ISSN 1057-9249, E-ISSN 1099-1611, Vol. 7, s. 141-142Artikkel i tidsskrift (Fagfellevurdert)
  • 53. Salander, P.
    et al.
    Karlsson, Thomas
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för beteendevetenskap, Avdelningen för kognition, utveckling och handikapp, CDD.
    Bergenheim, T.
    Henriksson, R.
    Long-Term Memory Deficits in Patients with Malignant Gliomas1995Inngår i: Journal of Neuro-Oncology, ISSN 0167-594X, E-ISSN 1573-7373, Vol. 25, s. 227-238Artikkel i tidsskrift (Fagfellevurdert)
  • 54.
    Samuelsson, Stefan
    et al.
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för beteendevetenskap, Avdelningen för pedagogik i utbildning och skola, PiUS.
    Bogges, Thomas
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap.
    Visual implicit memory deficit and developmental surface dyslexia: A case of early occipital damage2000Inngår i: Cortex, ISSN 0010-9452, E-ISSN 1973-8102, Vol. 36, nr 3, s. 365-376Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study reports the case of EBON, a fifteen-year-old right-handed female Swedish student, who suffered an early medial/dorsal occipital brain lesion and showed a clearly defined pattern of developmental surface dyslexia. EBON and 17 controls were examined with within and cross-modality (visual and auditory) word stem completion tasks together with tasks requiring free-recall and recognition for visually and auditory presented words. Compared to age-matched controls, EBON was found to show a significant deficit of visual priming following visual presentation, and a deficit approaching significance following auditory presentation. Explicit memory and visual and spatial abilities were not significantly different from controls. Therefore, EBON represents the first childhood case establishing the role of occipital regions in visual priming, as well as illustrating a profile of surface reading difficulty as a developmental consequence of this locus of lesion.

  • 55.
    Skagerlund, Kenny
    et al.
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Psykologi. Linköpings universitet, Filosofiska fakulteten.
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Träff, Ulf
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Psykologi. Linköpings universitet, Filosofiska fakulteten.
    Magnitude processing in the brain: an fMRI study of time, space, and numerosity as a shared cortical system2016Inngår i: Frontiers in Human Neuroscience, ISSN 1662-5161, E-ISSN 1662-5161, Vol. 10, nr 500Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Continuous dimensions, such as time, space, and numerosity, have been suggested to be subserved by common neurocognitive mechanisms. Neuroimaging studies that have investigated either one or two dimensions simultaneously have consistently identified neural correlates in the parietal cortex of the brain. However, the degree of neural overlap across several dimensions has yet to be established, and it remains an open question whether a potential overlap can be conceptualized as a neurocognitive magnitude processing system. The current functional resonance imaging (fMRI) study investigated the potential neurocognitive overlap across three dimensions. A sample of adults (N = 24) performed three different magnitude processing tasks: a temporal discrimination task, a number discrimination task, and a line length discrimination task. A conjunction analysis revealed several overlapping neural substrates across multiple magnitude dimensions, and we argue that these cortical nodes comprise a distributed magnitude processing system. Key components of this predominantly right-lateralized system include the intraparietal sulcus, insula, premotor cortex, inferior frontal gyrus and frontal eye-fields. Together with previous research highlighting IPS, our results suggest that the insula also is a core component of the magnitude processing system. We discuss the functional role of each of these components in the magnitude processing system and suggest that further research of this system may provide insight into the etiology of neurodevelopmental disorders where cognitive deficits in magnitude processing are manifest.

    Fulltekst (pdf)
    fulltext
  • 56. Svenmarker, S.
    et al.
    Engström, K.G.
    Karlsson, Thomas
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för beteendevetenskap, Avdelningen för kognition, utveckling och handikapp, CDD.
    Jansson, E.
    Lindholm, R.
    Åberg, T.
    Influence of pericardial suction blood retransfusion on memory function and release of protein S100B2004Inngår i: Perfusion, ISSN 0267-6591, E-ISSN 1477-111X, Vol. 19, nr 6, s. 337-343Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background: To study the influence of pericardial suction blood (PSB) on postoperative memory disturbances and release patterns of protein S100B during and after cardiopulmonary bypass (CPB). Methods: Sixty male patients admitted for coronary artery bypass surgery were prospectively randomized to receive PSB either by using conventional cardiotomy suction retransfusion or after cell-saver processing. Results: The concentration of S100B rose during the period of CPB from 0.065 ± 0.004 to 0.24 ± 0.001 μg/L (p <0.001). PSB contained 18.0 ± 1.7 μg/L of S100B. Direct retransfusion from the cardiotomy reservoir made the systemic level increase to 1.42 ± 0.19 μg/L compared to 0.25±0.02 μg/L using a cell-saver. Signs of postoperative memory dysfunction (>1 SD) were discovered in one of three tests, but were unrelated to technique of retransfusion. No associations were found between serum concentrations of S100B and memory function. Conclusion: In this study, retransfusion of PSB during cardiac surgery appeared not to cause memory disturbances. PSB contained high concentrations of protein S100B making its use as a marker of cerebral injury unsuitable. © Arnold 2004.

  • 57. Svenmarker, S.
    et al.
    Sandström, E.
    Karlsson, Thomas
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för beteendevetenskap, Avdelningen för kognition, utveckling och handikapp, CDD.
    Häggmark, S.
    Jansson, E.
    Appelblad, M.
    Lindholm, R.
    Åberg, T.
    Neurological and general outcome in low-risk coronary artery bypass patients using heparin coated circuits2001Inngår i: European Journal of Cardio-Thoracic Surgery, ISSN 1010-7940, E-ISSN 1873-734X, Vol. 19, s. 47-53Artikkel i tidsskrift (Fagfellevurdert)
  • 58. Svenmarker, S.
    et al.
    Sandström, E.
    Karlsson, Thomas
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för beteendevetenskap, Avdelningen för kognition, utveckling och handikapp, CDD.
    Jansson, E.
    Häggmark, S.
    Lindholm, R.
    Appelblad, M.
    Åberg, T.
    Clinical effects of the heparin coated surface in cardiopulmonary bypass1997Inngår i: European Journal of Cardio-Thoracic Surgery, ISSN 1010-7940, E-ISSN 1873-734X, Vol. 11, s. 957-964Artikkel i tidsskrift (Fagfellevurdert)
  • 59. Svenmarker, S.
    et al.
    Sandström, E.
    Karlsson, Thomas
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för beteendevetenskap, Avdelningen för kognition, utveckling och handikapp, CDD.
    Åberg, T.
    Is there an association between release of protein S100B during cardiopulmonary bypass and memory disturbances?2002Inngår i: Scandinavian Cardiovascular Journal, ISSN 1401-7431, E-ISSN 1651-2006, Vol. 36, nr 2, s. 117-122Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Objective-The use of protein S100B as a marker of brain cell injury in conjunction with cardiopulmonary bypass (CPB) has recently been questioned. The present study investigates functional brain injury based on the relation between S100B and memory disturbances. Methods-Four hundred and fifteen low-risk coronary artery bypass patients exposed to CPB were examined. The protein S100B was sampled during and after surgery. Explicit and implicit memory function was assessed preoperatively and at discharge from hospital. Possible associations between the release of the protein S100B and memory function were studied. Results-Serum concentration of S100B peaked at termination of CPB (0.895 ▒ 0.84 ╡g/l) and decreased gradually, 7 h post CPB (0.436 ▒ 0.59 ╡g/l), day 1 (0.149 ▒ 0.27 ╡g/l) and day 2 (0.043 ▒ 0.15 ╡g/l). High levels of S100B (> 1.5 ╡g/l) 7 h post CPB were associated with a significant (-1 SD) decline of explicit memory function (p = 0.006), this was not seen at termination of CPB (p = 0.834). Predictors of memory decline were S100B 7 h post CPB, length of stay in hospital and concomitant neurological disorders. Postoperative S100B concentration was higher among patients with atrial fibrillation (p = 0.022). Conclusion-Only high levels of protein S100B found 7 h post CPB were associated with decline of explicit memory function, not the release seen during CPB. Thus, when using protein S100B, only values several hours remote from surgery should be used as a brain cell injury marker.

  • 60.
    Sörqvist, Patrik
    et al.
    Linköpings universitet, Institutionen för beteendevetenskap, Avdelningen för kognition, utveckling och handikapp, CDD. Linköpings universitet, Filosofiska fakulteten. University of Gavle, Sweden.
    Dahlström, Örjan
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutet för handikappvetenskap (IHV).
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Rönnberg, Jerker
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutet för handikappvetenskap (IHV).
    Concentration: The Neural Underpinnings of How Cognitive Load Shields Against Distraction2016Inngår i: Frontiers in Human Neuroscience, ISSN 1662-5161, E-ISSN 1662-5161, Vol. 10, nr 221Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Whether cognitive load and other aspects of task difficulty increases or decreases distractibility is subject of much debate in contemporary psychology. One camp argues that cognitive load usurps executive resources, which otherwise could be used for attentional control, and therefore cognitive load increases distraction. The other camp argues that cognitive load demands high levels of concentration (focal task engagement), which suppresses peripheral processing and therefore decreases distraction. In this article, we employed an functional magnetic resonance imaging (fMRI) protocol to explore whether higher cognitive load in a visually-presented task suppresses task-irrelevant auditory processing in cortical and subcortical areas. The results show that selectively attending to an auditory stimulus facilitates its neural processing in the auditory cortex, and switching the locus-of-attention to the visual modality decreases the neural response in the auditory cortex. When the cognitive load of the task presented in the visual modality increases, the neural response to the auditory stimulus is further suppressed, along with increased activity in networks related to effortful attention. Taken together, the results suggest that higher cognitive load decreases peripheral processing of task-irrelevant information which decreases distractibility as a side effect of the increased activity in a focused-attention network.

    Fulltekst (pdf)
    fulltext
  • 61.
    Tisell, Anders
    et al.
    Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiofysik. Östergötlands Läns Landsting, Kirurgi- och onkologicentrum, Radiofysikavdelningen. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Engström, Maria
    Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Karlsson, Thomas
    Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Institutionen för beteendevetenskap och lärande. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Vigren, Patrik
    NSC.
    Dahlqvist Leinhard, Olof
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiofysik. Linköpings universitet, Hälsouniversitetet.
    Lundberg, Peter
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiofysik. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Kirurgi- och onkologicentrum, Radiofysikavdelningen. Östergötlands Läns Landsting, Bildmedicinskt centrum, Röntgenkliniken i Linköping.
    Etiology of periodic hypersomnia explored by combined functional and molecular neuroimaging methods2008Inngår i: World Molecular Imaging Conference,,2008, 2008Konferansepaper (Annet vitenskapelig)
    Abstract [en]

      

  • 62.
    van Ettinger-Veenstra, Helene
    et al.
    Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Gauffin, Helena
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för klinisk och experimentell medicin. Linköpings universitet, Hälsouniversitetet.
    McAllister, Anita
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Logopedi. Linköpings universitet, Hälsouniversitetet.
    Lundberg, Peter
    Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiofysik. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Östergötlands Läns Landsting, Centrum för kirurgi, ortopedi och cancervård, Radiofysikavdelningen US.
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap och lärande.
    Engström, Maria
    Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Language deficits in Epilepsy, an fMRI study2012Inngår i:  , 2012Konferansepaper (Fagfellevurdert)
  • 63.
    van Ettinger-Veenstra, Helene
    et al.
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet.
    Gauffin, Helena
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för klinisk och experimentell medicin, Neurologi. Linköpings universitet, Hälsouniversitetet.
    McAllister, Anita
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Logopedi. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Sinnescentrum, Öron- näsa- och halskliniken US.
    Lundberg, Peter
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiofysik. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Centrum för kirurgi, ortopedi och cancervård, Radiofysikavdelningen US.
    Ulrici, Daniel
    Östergötlands Läns Landsting, Närsjukvården i centrala Östergötland, Neurologiska kliniken.
    Landtblom, Anne-Marie
    Östergötlands Läns Landsting, Närsjukvården i centrala Östergötland, Neurologiska kliniken. Linköpings universitet, Institutionen för klinisk och experimentell medicin, Neurologi. Linköpings universitet, Hälsouniversitetet.
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap och lärande. Linköpings universitet, Filosofiska fakulteten.
    Engström, Maria
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet.
    Language deficits in Epilepsy, an fMRI study2012Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Cognitive functions in people with epilepsy are affected by focality, number of generalized seizures, side effects of antiepileptic drugs (AEDs) or the underlying disease (Kwan, 2001). Newly diagnosed patients have cognitive deficits even before starting on AEDs. Performance declines already in the first year after diagnosis and the impairment continues in the following years (Taylor, 2010; Baker, 2011). In mesial temporal lobe epilepsy (TLE) the hippocampal damage seems to be progressive and accompanied by thinning of neocortex (Briellmann, 2002; Bernhardt, 2009). Widespread structural and functional abnormalities in left TLE can affect more distant networks (Bonilha, 2009); a damage pattern also seen in right TLE (Karunanayaka, 2011).

  • 64.
    van Ettinger-Veenstra, Helene M
    et al.
    Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Ragnehed, Mattias
    Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Hällgren, Mathias
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Teknisk audiologi. Linköpings universitet, Hälsouniversitetet.
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap och lärande. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Landtblom, Anne-Marie
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Neurologi. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Närsjukvården i centrala Östergötland, Neurologiska kliniken. Östergötlands Läns Landsting, Närsjukvården i västra Östergötland, Medicinska specialistkliniken . Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Lundberg, Peter
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiofysik. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Kirurgi- och onkologicentrum, Radiofysikavdelningen. Östergötlands Läns Landsting, Bildmedicinskt centrum, Röntgenkliniken i Linköping.
    Engström, Maria
    Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Right-hemispheric brain activation correlates to language performance2010Inngår i: NEUROIMAGE, ISSN 1053-8119, Vol. 49, nr 4, s. 3481-3488Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Language function in the right-hemispheric homologues of Brocas and Wernickes areas does not only correlate with left-handedness or pathology, but occurs naturally in right-handed healthy subjects as well. In the current study, two non-invasive methods of assessing language lateralization are correlated with behavioral results in order to link hemispheric dominance to language ability in healthy subjects. Functional magnetic resonance imaging (fMRI) together with a sentence-completion paradigm was used to determine region-specific lateralization indices in the left- and right-sided Brocas and Wernickes areas, the frontal temporal lobe, the anterior cingulate cortex and the parietal lobe. In addition, dichotic listening results were used to determine overall language lateralization and to strengthen conclusions by correlating with fMRI indices. Results showed that fMRI lateralization in the superior parietal, the posterior temporal, and the anterior cingulate cortices correlated to dichotic listening. A decreased right ear advantage (REA), which indicates less left- hemispheric dominance in language, correlated with higher performance in most administered language tasks, including reading, language ability, fluency, and non-word discrimination. Furthermore, right hemispheric involvement in the posterior temporal lobe and the homologue of Brocas area suggests better performance in behavioral language tasks. This strongly indicates a supportive role of the right-hemispheric counterparts of Brocas and Wernickes areas in language performance.

    Fulltekst (pdf)
    FULLTEXT01
  • 65.
    Van Ettinger-Veenstra, Helene
    et al.
    Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för radiologiska vetenskaper. Linköpings universitet, Medicinska fakulteten. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Mcallister, Anita
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för neuro- och inflammationsvetenskap. Linköpings universitet, Medicinska fakulteten. Karolinska Institute, Sweden.
    Lundberg, Peter
    Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för radiologiska vetenskaper. Linköpings universitet, Medicinska fakulteten. Region Östergötland, Centrum för kirurgi, ortopedi och cancervård, Radiofysikavdelningen US. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Engström, Maria
    Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för radiologiska vetenskaper. Linköpings universitet, Medicinska fakulteten. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Higher Language Ability is Related to Angular Gyrus Activation Increase During Semantic Processing, Independent of Sentence Incongruency2016Inngår i: Frontiers in Human Neuroscience, ISSN 1662-5161, E-ISSN 1662-5161, Vol. 10, nr 110Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study investigates the relation between individual language ability and neural semantic processing abilities. Our aim was to explore whether high-level language ability would correlate to decreased activation in language-specific regions or rather increased activation in supporting language regions during processing of sentences. Moreover, we were interested if observed neural activation patterns are modulated by semantic incongruency similarly to previously observed changes upon syntactic congruency modulation. We investigated 27 healthy adults with a sentence reading task which tapped language comprehension and inference, and modulated sentence congruency employing functional magnetic resonance imaging (fMRI). We assessed the relation between neural activation, congruency modulation, and test performance on a high-level language ability assessment with multiple regression analysis. Our results showed increased activation in the left-hemispheric angular gyrus extending to the temporal lobe related to high language ability. This effect was independent of semantic congruency, and no significant relation between language ability and incongruency modulation was observed. Furthermore, there was a significant increase of activation in the inferior frontal gyrus (IFG) bilaterally when the sentences were incongruent, indicating that processing incongruent sentences was more demanding than processing congruent sentences and required increased activation in language regions. The correlation of high-level language ability with increased rather than decreased activation in the left angular gyrus, a region specific for language processing, is opposed to what the neural efficiency hypothesis would predict. We can conclude that no evidence is found for an interaction between semantic congruency related brain activation and highlevel language performance, even though the semantic incongruent condition shows to be more demanding and evoking more neural activation.

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  • 66.
    van Ettinger-Veenstra, Helene
    et al.
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet.
    McAllister, Anita
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Logopedi. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Sinnescentrum, Öron- näsa- och halskliniken US.
    Lundberg, Peter
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för radiologiska vetenskaper. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Centrum för kirurgi, ortopedi och cancervård, Radiofysikavdelningen US. Östergötlands Läns Landsting, Diagnostikcentrum, Röntgenkliniken i Linköping.
    Karlsson, Thomas
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Engström, Maria
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet.
    Laterality shifts in neural activation coupled to language ability2013Manuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    The right-hemispheric homologues to Broca’s and Wernicke’s area play an important, but currently poorly understood role in language ability. In the current study, we tested 27 healthy adults for their language ability. We acquired functional magnetic resonance imaging (fMRI) data when the participants performed a sentence reading and a word fluency task. The fMRI data were used to calculate a measure of brain laterality – the laterality index – in the inferior frontal gyrus, the superior and middle temporal gyrus, and the angular gyrus. These laterality measurements were correlated with performance scores on language tasks administered prior to fMRI. We expected to see that high performance was characterized by a more efficient, i.e. decreased, neural activation pattern in typical language areas. Furthermore, we expected to see activation in additional, right-hemispheric brain regions in high performing subjects as a sign of neural adaptability.

    High performance in a test measuring subtle language deficits (BeSS test) was related to increased activation in the right middle temporal gyrus when the participants were reading sentences. Thus, semantic ability correlated negatively with laterality in the temporal lobe, but not in the frontal lobe. For increased verbal fluency ability, we did observe a decreased left-hemispheric dominance in the inferior frontal gyrus when the participants were generating words. Increased task demands in the word generation task were not related to brain activation, but in the sentence reading task, the bilateral inferior frontal gyrus did exhibit an increase in activation when the sentences increased in difficulty. This result was independent of individual language ability. Increased brain activation at increased difficulty of a language task is interpreted as a sign that the brain recruits additional resources upon higher demands. The negative correlation between language ability and laterality in the in right-hemispheric middle temporal gyrus indicates a higher degree of neural adaptability in the temporal lobes of high skilled individuals.

  • 67.
    Vigren, Patrick
    et al.
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Neurologi. Linköpings universitet, Hälsouniversitetet. Linköpings universitet, Institutionen för klinisk och experimentell medicin, Neurokirurgi.
    Tisell, Anders
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiofysik. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Centrum för kirurgi, ortopedi och cancervård, Radiofysikavdelningen US.
    Engström, Maria
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Medicinsk radiologi. Linköpings universitet, Hälsouniversitetet.
    Karlsson, Thomas
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Dahlqvist Leinhard, Olof
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för radiologiska vetenskaper. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Centrum för kirurgi, ortopedi och cancervård, Radiofysikavdelningen US.
    Lundberg, Peter
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för radiologiska vetenskaper. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Centrum för kirurgi, ortopedi och cancervård, Radiofysikavdelningen US. Östergötlands Läns Landsting, Diagnostikcentrum, Röntgenkliniken i Linköping.
    Landtblom, Anne-Marie
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Linköpings universitet, Institutionen för klinisk och experimentell medicin, Neurologi. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Närsjukvården i centrala Östergötland, Neurologiska kliniken.
    Low Thalamic NAA-Concentration Corresponds to Strong Neural Activation in Working Memory in Kleine-Levin Syndrome2013Inngår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 8, nr 2Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background

    Kleine Levin Syndrome (KLS) is a rare disorder of periodic hypersomnia and behavioural disturbances in young individuals. It has previously been shown to be associated with disturbances of working memory (WM), which, in turn, was associated with higher activation of the thalamus with increasing WM load, demonstrated with functional magnetic resonance imaging (fMRI). In this study we aimed to further elucidate how these findings are related to the metabolism of the thalamus.

    Methods

    fMRI and magnetic resonance spectroscopy were applied while performing a WM task. Standard metabolites were examined: n-acetylaspartate (NAA), myo-inositol, choline, creatine and glutamate-glutamine. Fourteen KLS-patients and 15 healthy controls participated in the study. The patients with active disease were examined in asymptomatic periods.

    Results

    There was a statistically significant negative correlation between thalamic fMRI-activation and thalamic NAA, i.e., high fMRI-activation corresponded to low NAA-levels. This correlation was not seen in healthy controls. Thalamic levels of NAA in patients and controls showed no significant differences between the groups. None of the other metabolites showed any co-variation with fMRI-activiation.

    Conclusion

    This study shows negative correlation between NAA-levels and fMRI-activity in the left thalamus of KLS-patients while performing a WM task. This correlation could not be found in healthy control subjects, primarily interpreted as an effect of increased effort in the patient group upon performing the task. It might indicate a disturbance in the neuronal networks responsible for WM in KLS patients, resulting in higher effort at lower WM load, compared with healthy subjects. The general relationship between NAA and BOLD-signal is also discussed in the article.

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  • 68.
    Wikgren, Mikael
    et al.
    Umeå University.
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Lind, Johanna
    University of Oslo, Norway .
    Nilbrink, Therese
    Umeå University.
    Hultdin, Johan
    Umeå University.
    Sleegers, Kristel
    University of Antwerp, Belgium.
    Van Broeckhoven, Christine
    University of Antwerp, Belgium.
    Roos, Göran
    Umeå University.
    Nilsson, Lars-Göran
    Stockholm University and Stockholm Brain Institute.
    Nyberg, Lars
    Umeå University.
    Adolfsson, Rolf
    Umeå University.
    Norrback, Karl-Fredrik
    Umeå University.
    Longer Leukocyte Telomere Length Is Associated with Smaller Hippocampal Volume among Non-Demented APOE epsilon 3/epsilon 3 Subjects2012Inngår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 7, nr 4Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Telomere length shortens with cellular division, and leukocyte telomere length is used as a marker for systemic telomere length. The hippocampus hosts adult neurogenesis and is an important structure for episodic memory, and carriers of the apolipoprotein E epsilon 4 allele exhibit higher hippocampal atrophy rates and differing telomere dynamics compared with non-carriers. The authors investigated whether leukocyte telomere length was associated with hippocampal volume in 57 cognitively intact subjects (29 epsilon 3/epsilon 3 carriers; 28 epsilon 4 carriers) aged 49-79 yr. Leukocyte telomere length correlated inversely with left (r(s) = -0.465; p = 0.011), right (r(s) = -0.414; p = 0.025), and total hippocampus volume (r(s) = -0.519; p = 0.004) among APOE epsilon 3/epsilon 3 carriers, but not among epsilon 4 carriers. However, the epsilon 4 carriers fit with the general correlation pattern exhibited by the epsilon 3/epsilon 3 carriers, as epsilon 4 carriers on average had longer telomeres and smaller hippocampi compared with epsilon 3/epsilon 3 carriers. The relationship observed can be interpreted as long telomeres representing a history of relatively low cellular proliferation, reflected in smaller hippocampal volumes. The results support the potential of leukocyte telomere length being used as a biomarker for tapping functional and structural processes of the aging brain.

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  • 69.
    Wikgren, Mikael
    et al.
    Umeå University.
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap och lärande. Linköpings universitet, Filosofiska fakulteten.
    Nilbrink, Therese
    Umeå University.
    Nordfjall, Katarina
    Umeå University.
    Hultdin, Johan
    Umeå University.
    Sleegers, Kristel
    VIB.
    Van Broeckhoven, Christine
    VIB.
    Nyberg, Lars
    Umeå University.
    Roos, Goran
    Umeå University.
    Nilsson, Lars-Goran
    Stockholm University.
    Adolfsson, Rolf
    Umeå University.
    Norrback, Karl-Fredrik
    Umeå University.
    APOE epsilon 4 is associated with longer telomeres, and longer telomeres among epsilon 4 carriers predicts worse episodic memory2012Inngår i: Neurobiology of Aging, ISSN 0197-4580, E-ISSN 1558-1497, Vol. 33, nr 2, s. 335-344Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Both leukocyte telomere length and the apolipoprotein epsilon 4 allele have been associated with mortality, cardiovascular disease, cognition, and dementia. The authors investigated whether leukocyte telomere length was associated with APOE genotype or cognitive abilities in the context of APOE genotype. The setting for this cross-sectional study was 427 nondemented individuals aged 41-81 yr. The authors found that epsilon 4 carriers overall exhibited significantly longer telomeres compared with non-carriers (difference of 268 bp, p = 0.001). This difference was greatest at the lower limit of the age span and nonsignificant at the upper limit, which translated into a significantly higher telomere attrition rate (p = 0.049) among epsilon 4 carriers (37 bp/years) compared with non-carriers (21 bp/year). Further, longer telomeres among epsilon 4 carriers significantly predicted worse performance on episodic memory tasks. No significant associations were found on tasks tapping semantic and visuospatial ability, or among epsilon 3/epsilon 3 carriers. In conclusion, APOE epsilon 4 carriers had longer telomeres compared with non-carriers, but higher rate of attrition. Among them, longer telomeres predicted worse performance on episodic memory tasks. These observations suggest that the epsilon 4 allele is associated with abnormal cell turnover of functional and possibly clinical significance.

  • 70.
    Wikgren, Mikael
    et al.
    Umeå University, Sweden.
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Söderlund, Hedvig
    Uppsala University, Sweden.
    Nordin, Annelie
    Umeå University, Sweden.
    Roos, Göran
    Umeå University, Sweden.
    Nilsson, Lars-Göran
    Stockholm University, Sweden.
    Adolfsson, Rolf
    Umeå University, Sweden.
    Norrback, Karl-Fredrik
    Umeå University, Sweden.
    Shorter telomere length is linked to brain atrophy and white matter hyperintensities.2014Inngår i: Age and Ageing, ISSN 0002-0729, E-ISSN 1468-2834, Vol. 43, nr 2, s. 212-217Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background: leukocyte telomere length (TL) is considered a marker of biological aging. Several studies have investigated the link between leukocyte TL and aging-associated functional attributes of the brain, but no prior study has investigated whether TL can be linked to brain atrophy and white matter hyperintensities (WMHs); two prominent structural manifestations of brain aging.

    Methods: we investigated whether leukocyte TL was related to brain atrophy and WMHs in a sample of 102 non-demented individuals aged 64–75 years.

    Results: shorter TL was related to greater degree of subcortical atrophy (β = −0.217, P = 0.034), but not to cortical atrophy. Furthermore, TL was 371 bp shorter (P = 0.041) in participants exhibiting subcortical WMHs, and 552 bp shorter (P = 0.009) in older participants exhibiting periventricular WMHs.

    Conclusion: this study provides the first evidence of leukocyte TL being associated with cerebral subcortical atrophy and WMHs, lending further support to the concept of TL as a marker of biological aging, and in particular that of the aging brain.

  • 71.
    Wikgren, Mikael
    et al.
    Umeå University.
    Maripuu, Martin
    Umeå University.
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap och lärande. Linköpings universitet, Filosofiska fakulteten.
    Nordfjall, Katarina
    Umeå University.
    Bergdahl, Jan
    Umeå University.
    Hultdin, Johan
    Umeå University.
    Del-Favero, Jurgen
    University of Antwerp.
    Roos, Goran
    Umeå University.
    Nilsson, Lars-Goran
    Stockholm University.
    Adolfsson, Rolf
    Umeå University.
    Norrback, Karl-Fredrik
    Umeå University.
    Short Telomeres in Depression and the General Population Are Associated with a Hypocortisolemic State2012Inngår i: Biological Psychiatry, ISSN 0006-3223, E-ISSN 1873-2402, Vol. 71, nr 4, s. 294-300Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background: The hypothalamic-pituitary-adrenal (HPA) axis plays a central role in stress regulation, and leukocyte telomere length (TL) has been suggested to represent a cumulative measure of stress. Depression is intimately related with stress and frequently exhibits a dysregulated HPA axis. We aimed to study the relationships between TL and biological and psychological facets of stress in recurrent major depressive disorder and controls. less thanbrgreater than less thanbrgreater thanMethods: Leukocyte TL was measured in 91 subjects with recurrent major depressive disorder and 451 control subjects. Stress was assessed from both a biological perspective, by assessing HPA axis function with a weight-adjusted very-low-dose dexamethasone suppression test (DST), and a psychological perspective, with self-report questionnaires. less thanbrgreater than less thanbrgreater thanResults: TL was shorter among patients compared with control subjects (277 base pairs, p = .001). Overall, short TL was associated with a hypocortisolemic state (low post-DST cortisol and high percentage of cortisol reduction after the DST) among both patients and control subjects but more pronounced among patients. This state, which was overrepresented among patients, was characterized by high familial loading of affective disorders among patients (p = .001) and high C-reactive protein levels among control subjects (p = .040). TL was also inversely associated with stress measured with the Perceived Stress Questionnaire (r(s) = -.258, p = .003). less thanbrgreater than less thanbrgreater thanConclusions: Short TL is associated with depression and hypocortisolism. Because hypocortisolism has been shown to develop from chronic stress exposure, our findings corroborate the concept of TL as a cumulative measure of stress and provide novel insights into the detrimental role of stress in depressive illness and the general population.

  • 72.
    Witt, Suzanne T.
    et al.
    Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Drissi, Natasha Morales
    Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för radiologiska vetenskaper. Linköpings universitet, Medicinska fakulteten. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Tapper, Sofie
    Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för radiologiska vetenskaper. Linköpings universitet, Medicinska fakulteten. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Region Östergötland, Diagnostikcentrum, Röntgenkliniken i Linköping.
    Wretman, Anna
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten.
    Szakács, Attila
    Sahlgrenska Academy, University of Gothenburg, Sweden.
    Hallböök, Tove
    Sahlgrenska Academy, University of Gothenburg, Sweden.
    Landtblom, Anne-Marie
    Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för neuro- och inflammationsvetenskap. Linköpings universitet, Medicinska fakulteten. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Region Östergötland, Närsjukvården i centrala Östergötland, Neurologiska kliniken. Uppsala University, Uppsala, Sweden.
    Karlsson, Thomas
    Linköpings universitet, Institutionen för beteendevetenskap och lärande, Handikappvetenskap. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Lundberg, Peter
    Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för radiologiska vetenskaper. Linköpings universitet, Medicinska fakulteten. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV. Region Östergötland, Diagnostikcentrum, Röntgenkliniken i Linköping. Region Östergötland, Diagnostikcentrum, Medicinsk strålningsfysik.
    Engström, Maria
    Linköpings universitet, Institutionen för medicin och hälsa, Avdelningen för radiologiska vetenskaper. Linköpings universitet, Medicinska fakulteten. Linköpings universitet, Centrum för medicinsk bildvetenskap och visualisering, CMIV.
    Evidence for cognitive resource imbalance in adolescents with narcolepsy2018Inngår i: Brain Imaging and Behavior, ISSN 1931-7557, E-ISSN 1931-7565, Vol. 12, nr 2, s. 411-424Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The study investigated brain activity changes during performance of a verbal working memory task in a population of adolescents with narcolepsy. Seventeen narcolepsy patients and twenty healthy controls performed a verbal working memory task during simultaneous fMRI and EEG acquisition. All subjects also underwent MRS to measure GABA and Glutamate concentrations in the medial prefrontal cortex. Activation levels in the default mode network and left middle frontal gyrus were examined to investigate whether narcolepsy is characterized by an imbalance in cognitive resources. Significantly increased deactivation within the default mode network during task performance was observed for the narcolepsy patients for both the encoding and recognition phases of the task. No evidence for task performance deficits or reduced activation within the left middle frontal gyrus was noted for the narcolepsy patients. Correlation analyses between the spectroscopy and fMRI data indicated that deactivation of the anterior aspect of the default mode in narcolepsy patients correlated more with increased concentrations of Glutamate and decreased concentrations of GABA. In contrast, deactivation in the default mode was correlated with increased concentrations of GABA and decreased concentrations of Glutamate in controls. The results suggested that narcolepsy is not characterized by a deficit in working memory but rather an imbalance of cognitive resources in favor of monitoring and maintaining attention over actual task performance. This points towards dysregulation within the sustained attention system being the origin behind self-reported cognitive difficulties in narcolepsy.

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