Cognitive modularity and genetic disorders.

Area of Science:

• Developmental psychology
• Neuroscience
• Genetics

Background:

• Adult neuropsychological models are often applied to understand genetic developmental disorders.
• Existing models assume cognitive profiles in childhood or adulthood reflect initial infant states, with modules being either intact or impaired from birth.

Purpose of the Study:

• To challenge the application of adult neuropsychological models to genetic developmental disorders.
• To investigate the developmental trajectories of cognitive abilities in infants with Williams syndrome.

Main Methods:

• Two experiments were conducted with infants diagnosed with Williams syndrome.
• Cognitive assessments focused on numerosity judgments and language abilities at different developmental stages.

Main Results:

• A within-syndrome double dissociation was observed in Williams syndrome.
• Infants performed well on numerosity tasks in infancy but declined in adulthood.
• Conversely, language abilities were poor in infancy but improved in adulthood.

Conclusions:

• Developmental trajectories in genetic disorders can be complex and do not necessarily align with adult models.
• Findings suggest a dynamic interplay of cognitive development, challenging assumptions of static innate modularity.
• Results may necessitate a re-evaluation of theoretical and clinical approaches to studying genetic disorders.