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Cerebral specialization in individuals with Down syndrome.
D Elliott1, D J Weeks, C L Elliott
1McMaster University.
American Journal of Mental Retardation : AJMR
|November 1, 1987
Summary
Individuals with Down syndrome (DS) may not have reversed brain specialization for speech. A new model suggests a biological split between speech perception and production in DS.
Area of Science:
- Neuroscience
- Developmental Psychology
- Genetics
Background:
- Cerebral specialization refers to the lateralization of brain functions.
- Down syndrome (DS) is a genetic disorder often associated with cognitive and developmental differences.
- Previous research on cerebral specialization in DS has yielded conflicting results.
Purpose of the Study:
- To review existing research on cerebral specialization in individuals with Down syndrome.
- To evaluate the evidence for a reversed cerebral specialization model in DS.
- To propose an alternative model of cerebral specialization in DS.
Main Methods:
- Review of existing literature on dichotic listening studies and other experimental paradigms.
- Analysis of evidence regarding speech perception and speech production in individuals with DS.
- Theoretical modeling of cerebral specialization based on biological dissociation.
Main Results:
- Dichotic listening studies suggest a right-hemisphere advantage for speech sounds in individuals with DS.
- Evidence from other experimental paradigms challenges a simple model of reversed cerebral specialization in DS.
- A model proposing biological dissociation between speech perception and production in DS is supported.
Conclusions:
- A simple model of reversed cerebral specialization for speech in individuals with DS is untenable.
- A more nuanced model involving biological dissociation between speech perception and production is proposed for DS.
- Future research should explore this dissociation to better understand neurodevelopmental differences in DS.