Working Memory for Signs with Poor Visual Resolution: fMRI Evidence of Reorganization of Auditory Cortex in Deaf Signers
| Autor: | Emil Holmer, Krister Schönström, Josefine Andin, Mary Rudner |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Adult
Male Cognitive Neuroscience Deafness Stimulus (physiology) Sign language Auditory cortex working memory Task (project management) Sign Language Young Adult Cellular and Molecular Neuroscience Reaction Time Humans AcademicSubjects/MED00385 n-back Visual resolution Auditory Cortex Neuronal Plasticity AcademicSubjects/SCI01870 Working memory fMRI Neurosciences deaf early signers Speech processing Magnetic Resonance Imaging visual resolution Memory Short-Term Visual Perception Original Article AcademicSubjects/MED00310 Female Psychology Neuroscience Photic Stimulation Neurovetenskaper |
| Zdroj: | Cerebral Cortex (New York, NY) |
| ISSN: | 1460-2199 1047-3211 |
| DOI: | 10.1093/cercor/bhaa400 |
| Popis: | 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. Funding; Swedish Research CouncilSwedish Research CouncilEuropean Commission [2015-00929] |
| Databáze: | OpenAIRE |
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