Why do individuals with Williams syndrome or Down syndrome fail the Weather Prediction Task?

Area of Science:

• Neuroscience
• Cognitive Psychology
• Genetics

Background:

• Williams syndrome (WS) and Down syndrome (DS) are neurodevelopmental disorders with distinct genetic origins.
• Both conditions are associated with mild to moderate intellectual disability.
• Individuals with WS and DS show impaired hippocampus-dependent learning but enhanced striatum-dependent learning.

Purpose of the Study:

• To investigate learning strategies in WS and DS outside the spatial domain using the Weather Prediction Task (WPT).
• To determine if concurrent memory tasks improve procedural learning in WS.
• To assess the impact of probabilistic feedback and distractors on WPT performance in WS and DS.

Main Methods:

• Utilized the Weather Prediction Task (WPT) to assess learning strategies.
• Administered a concurrent memory task to evaluate procedural learning enhancement.
• Employed a visual learning task with varying reward contingencies and a modified WPT with unpredictable cues to examine performance under challenging conditions.

Main Results:

• Only 10% of individuals with WS or DS successfully solved the WPT.
• A concurrent memory task did not improve WPT performance in individuals with WS.
• Both probabilistic feedback and distractors significantly impaired WPT performance in individuals with WS and DS.

Conclusions:

• Findings suggest deficits in hippocampus-dependent learning and executive functions in WS and DS.
• Congruent feedback and minimizing distractors are crucial for optimizing learning in these populations.
• WS and DS populations exhibit similar learning challenges in non-spatial probabilistic learning tasks.