The impact of developmental visuospatial learning difficulties on British Sign Language.

Area of Science:

• Cognitive Neuroscience
• Developmental Psychology
• Linguistics

Background:

• Williams syndrome presents a unique dissociation between relatively preserved language and impaired visuospatial cognition.
• Understanding these dissociations offers insights into the relationship between language and cognition.

Observation:

• A case study of Heather, who has Williams syndrome-like cognitive abilities but is congenitally deaf and uses British Sign Language (BSL).
• Heather exhibits visuospatial deficits (drawing, form discrimination) but intact face discrimination.
• She demonstrates strong BSL vocabulary and grammar but struggles with linguistically spatial aspects of BSL.

Findings:

• Specific visuospatial learning difficulties can impair linguistic systems, even in visuospatial languages like BSL.
• The study highlights how reliance on spatial representations in language can be a vulnerability.
• Heather's case provides a unique model for dissociations between language and visuospatial cognition.

Implications:

• Challenges existing models of language and visuospatial cognition.
• Suggests that spatial processing is crucial for certain aspects of sign language acquisition and use.
• Informs understanding of developmental disorders affecting both language and spatial abilities.