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The episodic buffer in children with intellectual disabilities: an exploratory study.

¹Department of Psychology, London South Bank University, 103, Borough Road, London SE1 0AA, UK. henrylc@lsbu.ac.uk

Research in Developmental Disabilities

|June 12, 2010

Summary

Children with intellectual disabilities (ID) performed similarly to typically developing peers of the same mental age on verbal tasks involving working memory integration. Their development appears delayed, not fundamentally different.

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Area of Science:

Cognitive Psychology
Developmental Psychology
Neuroscience

Background:

The 'episodic buffer' model of working memory integrates long-term semantic knowledge, linguistic information, phonological working memory, and executive functions.
Children with intellectual disabilities (ID) often exhibit deficits in phonological short-term memory but may possess richer long-term memory representations due to life experience.

Purpose of the Study:

To assess the performance of children with ID on verbal tasks measuring the integration of information within the episodic buffer.
To determine if children with ID perform at a mental age level or chronological age level on these tasks.
To investigate whether findings support a 'delayed' or 'different' developmental trajectory for children with ID.

Main Methods:

Children with ID and typically developing children were assessed on three verbal measures: story recall, paired associate learning, and category fluency.
Performance was compared between children with ID and typically developing children matched for mental age and chronological age.

Main Results:

Children with ID demonstrated performance equivalent to mental age-matched peers on all three verbal tasks.
Performance for children with ID did not reach the level of their typically developing chronological age peers.
The results indicate that children with ID can integrate information from various sources within the episodic buffer at a mental age level.

Conclusions:

Children with intellectual disabilities perform at a mental age level on verbal tasks requiring the integration of information, supporting the episodic buffer model.
The findings suggest a 'delayed' developmental trajectory for children with ID in these cognitive functions, rather than a fundamentally 'different' one.
This research contributes to understanding the cognitive profiles of children with ID and informs developmental psychology theories.