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Reversing spoken items: mind twisting not tongue twisting
Linköping University, Department of Behavioural Sciences and Learning, Cognition, Development and Disability. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Swedish Institute for Disability Research. Linköping University, Department of Behavioural Sciences and Learning, Disability Research. Linköping University, Faculty of Arts and Sciences.
Department of Biological and Medical Psychology, University of Bergen, Bergen, Norway.
2005 (English)In: Brain and Language, ISSN 0093-934X, Vol. 92, no 1, 78-90 p.Article in journal (Refereed) Published
Abstract [en]

Using 12 participants we conducted an fMRI study involving two tasks, word reversal and rhyme judgment, based on pairs of natural speech stimuli, to study the neural correlates of manipulating auditory imagery under taxing conditions. Both tasks engaged the left anterior superior temporal gyrus, reflecting previously established perceptual mechanisms. Engagement of the left inferior frontal gyrus in both tasks relative to baseline could only be revealed by applying small volume corrections to the region of interest, suggesting that phonological segmentation played only a minor role and providing further support for factorial dissociation of rhyming and segmentation in phonological awareness. Most importantly, subtraction of rhyme judgment from word reversal revealed activation of the parietal lobes bilaterally and the right inferior frontal cortex, suggesting that the dynamic manipulation of auditory imagery involved in mental reversal of words seems to engage mechanisms similar to those involved in visuospatial working memory and mental rotation. This suggests that reversing spoken items is a matter of mind twisting rather than tongue twisting and provides support for a link between language processing and manipulation of mental imagery.

Place, publisher, year, edition, pages
2005. Vol. 92, no 1, 78-90 p.
Keyword [en]
Speech; Auditory imagery; Word reversal; Parietal lobes; Spatial processing; Rhyme judgment; fMRI
National Category
Social Sciences
Identifiers
URN: urn:nbn:se:liu:diva-13358DOI: 10.1016/j.bandl.2004.05.010OAI: oai:DiVA.org:liu-13358DiVA: diva2:20477
Available from: 2005-09-21 Created: 2005-09-21 Last updated: 2017-11-06
In thesis
1. Modalities of Mind: Modality-specific and nonmodality-specific aspects of working memory for sign and speech
Open this publication in new window or tab >>Modalities of Mind: Modality-specific and nonmodality-specific aspects of working memory for sign and speech
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Language processing is underpinned by working memory and while working memory for signed languages has been shown to display some of the characteristics of working memory for speech-based languages, there are a range of anomalous effects related to the inherently visuospatial modality of signed languages. On the basis of these effects, four research questions were addressed in a series of studies:

1. Are differences in working memory storage for sign and speech reflected in neural representation?

2. Do the neural networks supporting speech-sign switching during a working memory task reflect executive or semantic processes?

3. Is working memory for sign language enhanced by a spatial style of information presentation?

4. Do the neural networks supporting word reversal indicate tongue-twisting or mind-twisting?

The results of the studies showed that:

1. Working memory for sign and speech is supported by a combination of modality-specific and nonmodality-specific neural networks.

2. Switching between sign and speech during a working memory task is supported by semantic rather than executive processes.

3. Working memory performance in educationally promoted native deaf signers is enhanced by a spatial style of presentation.

4. Word reversal is a matter of mind-twisting, rather than tongue-twisting.

These findings indicate that working memory for sign and speech has modality-specific components as well as nonmodality-specific components. Modality-specific aspects can be explained in terms of Wilson’s (2001) sensorimotor account, which is based on the component model (Baddeley, 2000), given that the functionality of the visuospatial sketchpad is extended to include language processing. Nonmodality-specific working memory processing is predicted by Rönnberg’s (2003) model of cognitive involvement in language processing. However, the modality-free, cross-modal and extra-modal aspects of working memory processing revealed in the present work can be explained in terms of the central executive and the episodic buffer, providing the functionality and neural representation of the episodic buffer are extended.

A functional ontology is presented which ties cognitive processes to their neural representation, along with a model explaining modality-specific findings relating to sign language cognition. Predictions of the ontology and the model are discussed in relation to future work.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2005. 118 + papers I-V p.
Series
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 337Studies from the Swedish Institute for Disability Research, ISSN 1650-1128 ; 18
Keyword
Cognition, sign language, working memory, fMRI, PET, disability research, Korttidsminne, teckenspråk
National Category
Human Computer Interaction
Identifiers
urn:nbn:se:liu:diva-3942 (URN)91-85457-10-8 (ISBN)
Public defence
2005-10-21, Key 1, Key-huset, Campus Valla, Linköping, 13:00 (English)
Opponent
Supervisors
Available from: 2005-09-21 Created: 2005-09-21 Last updated: 2017-11-06Bibliographically approved

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Rudner, MaryRönnberg, Jerker

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