Path Integration and Cognitive Mapping Capacities in Down and Williams Syndromes.

Area of Science:

• Neuroscience
• Developmental Psychology
• Genetics

Background:

• Williams syndrome (WS) and Down syndrome (DS) are neurodevelopmental disorders with distinct genetic bases.
• Individuals with DS exhibit spatial learning abilities aligned with their mental age, whereas those with WS show severe impairments.
• The visuo-constructive deficits in WS raise questions about whether their spatial memory issues stem from visual processing problems or an inability to form cognitive maps.

Purpose of the Study:

• To investigate spatial learning and cognitive mapping abilities in individuals with WS and DS using blindfolded tasks.
• To differentiate between visual processing deficits and cognitive mapping impairments in WS.
• To assess the role of path integration and cognitive map formation in these neurodevelopmental disorders.

Main Methods:

• Participants with WS, DS, and typically developing (TD) children were tested blindfolded on path integration for homing and cognitive mapping tasks.
• The homing task assessed the ability to return to a starting point using path integration.
• The cognitive mapping task evaluated the ability to navigate novel routes and take shortcuts between objects.

Main Results:

• 96% of TD children, 84% of individuals with DS, and 44% with WS successfully used path integration to return to their start.
• Cognitive mapping abilities, demonstrated by shortcut navigation, were present in 64% of TD children and 74% of individuals with DS.
• Only one participant with WS could build a cognitive map, suggesting severe spatial learning deficits.

Conclusions:

• Spatial learning and cognitive map formation are severely impacted in Williams syndrome.
• Hippocampus-dependent spatial learning appears relatively preserved in Down syndrome.
• These findings highlight distinct spatial memory profiles in WS and DS, linked to underlying neurodevelopmental differences.