Atypical signed language development: a case study of challenges with visual-spatial processing

Area of Science:

• Linguistics
• Developmental Psychology
• Cognitive Science

Background:

• Signed languages utilize articulatory space for grammar, topography, and spatial depiction.
• Acquisition of signed languages may depend on concurrent visual-spatial development.
• The relationship between spatial cognition and signed language acquisition is a key research area.

Observation:

• A case study of a deaf adolescent with average intelligence, a native signer of American Sign Language (ASL).
• The individual exhibited early difficulties with spatial aspects of ASL.
• She demonstrated generally good ASL skills but struggled with specific spatial tasks.

Findings:

• The adolescent showed particular difficulties with tasks requiring attention to ASL's topographic space and shifts in visual perspective.
• These challenges were noted in classifier use and referential shifts within ASL.
• The study identified specific visual-spatial processing deficits in the participant.

Implications:

• Difficulties in visual-spatial abilities can impede the acquisition of spatially-dependent aspects of signed languages like ASL.
• This case highlights the critical interplay between visual-spatial processing and linguistic development in signed language acquisition.
• Further research is needed to understand the precise mechanisms linking spatial cognition and signed language learning.