Verbal working memory in children with mild intellectual disabilities.

Area of Science:

• Cognitive Psychology
• Developmental Psychology
• Neuroscience

Background:

• Individuals with intellectual disabilities (ID) exhibit known working memory deficits.
• This study investigates working memory in children with mild ID (IQ 55-85).
• The Baddeley model, comprising the central executive and phonological loop/visuo-spatial sketchpad, frames the investigation.

Purpose of the Study:

• To examine working memory components in children with mild ID.
• To compare the performance of children with mild ID to chronological and mental age-matched controls.
• To understand the implications of working memory deficits for developmental delay and remedial training.

Main Methods:

• Three groups were assessed: 50 children with mild ID, 25 chronological age-matched controls, and 25 mental age-matched controls.
• Participants' mean ages were 15 years 3 months (mild ID and chronological controls) and 10 years 10 months (mental age controls).
• Multiple assessments targeted phonological loop capacity and central executive functions.

Main Results:

• Children with mild ID demonstrated intact automatic rehearsal.
• Significant deficits were observed in phonological loop capacity and central executive tests compared to chronological age-matched controls.
• Minimal performance differences were noted when compared to mental age-matched controls.

Conclusions:

• The results support a developmental delay model for mild ID.
• A specific deficit in phonological loop capacity was identified.
• This phonological loop deficit has significant implications for designing remedial training for children with mild ID.