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Working Memory for Signs with Poor Visual Resolution: fMRI Evidence of Reorganizationof Auditory Cortex in Deaf Signers
Linköping University, Department of Behavioural Sciences and Learning, Disability Research. Linköping University, Faculty of Arts and Sciences.ORCID iD: 0000-0001-7091-9635
Linköping University, Department of Behavioural Sciences and Learning, Disability Research. Linköping University, Faculty of Arts and Sciences.ORCID iD: 0000-0002-1896-8250
Department of Linguistics, Stockholm University, Stockholm, Sweden.
Linköping University, Department of Behavioural Sciences and Learning, Psychology. Linköping University, Faculty of Arts and Sciences. Linköping University, Center for Medical Image Science and Visualization (CMIV). Swedish Institute for Disability Research, Linnaeus Centre HEAD, Sweden.
2021 (English)In: Cerebral Cortex, ISSN 1047-3211, E-ISSN 1460-2199, Vol. 31, no 7, p. 3165-3176Article in journal (Refereed) Published
Abstract [en]

Stimulus degradation adds to working memory load during speech processing.We investigated whether this applies to signprocessing and, if so, whether the mechanism implicates secondary auditory cortex.We conducted an fMRI experimentwhere 16 deaf early signers (DES) and 22 hearing non-signers performed a sign-based n-back task with three load levels andstimuli presented at high and low resolution.We found decreased behavioral performance with increasing load anddecreasing visual resolution, but the neurobiological mechanisms involved differed between the two manipulations and didso for both groups. Importantly, while the load manipulation was, as predicted, accompanied by activation in thefrontoparietal working memory network, the resolution manipulation resulted in temporal and occipital activation.Furthermore, we found evidence of cross-modal reorganization in the secondary auditory cortex: DES had strongeractivation and stronger connectivity between this and several other regions.We conclude that load and stimulus resolutionhave different neural underpinnings in the visual–verbal domain, which has consequences for current working memorymodels, and that for DES the secondary auditory cortex is involved in the binding of representations when task demandsare low.

Place, publisher, year, edition, pages
Oxford University Press, 2021. Vol. 31, no 7, p. 3165-3176
National Category
Neurosciences
Identifiers
URN: urn:nbn:se:liu:diva-173699DOI: 10.1093/cercor/bhaa400ISI: 000670805500001PubMedID: 33625498OAI: oai:DiVA.org:liu-173699DiVA, id: diva2:1532659
Funder
Swedish Research Council, 2015-00929
Note

Funding; Swedish Research CouncilSwedish Research CouncilEuropean Commission [2015-00929]

Available from: 2021-03-02 Created: 2021-03-02 Last updated: 2023-12-28Bibliographically approved

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Andin, JosefineHolmer, EmilRudner, Mary

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