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Neural correlates of working memory for sign language
Jerker Rönnberg1, Mary Rudner, Martin Ingvar
1Department of Behavioural Sciences, Linköpings universitet, Swedish Institute for Disability Research, S-581 83 Linköping, Sweden. jr@ibv.liu.se
Brain Research. Cognitive Brain Research
|June 9, 2004
Summary
Swedish Sign Language (SSL) has a unique brain network for working memory, distinct from spoken language. This study reveals modality-specific neural architecture for sign language processing.
Area of Science:
- Neuroscience
- Cognitive Science
- Linguistics
Background:
- Working memory is crucial for language processing.
- Previous research has primarily focused on spoken language modalities.
- The neural underpinnings of working memory for sign languages remain underexplored.
Purpose of the Study:
- To investigate the neural architecture of working memory for Swedish Sign Language (SSL).
- To compare the working memory networks of SSL with those of audiovisual Swedish speech.
- To explore potential age of acquisition effects on sign language working memory.
Main Methods:
- Positron Emission Tomography (PET) study.
- Within-subjects design comparing working memory for SSL and spoken Swedish.
- Eight early bilingual sign language interpreters participated.
Main Results:
- Identified a novel, language modality-specific neural architecture for SSL working memory.
- Observed bilateral temporal, bilateral parietal, and left premotor activation for SSL.
- Found differential activation in the right cerebellum between the two language modalities.
- Noted similarities in Broca's area and anterior left inferior frontal lobe for both modalities.
Conclusions:
- SSL working memory relies on a distinct neural network compared to spoken language.
- Bilateral parietal activation in SSL may relate to visuospatial processing.
- Findings contribute to understanding the neurobiology of sign language and working memory.