Working memory in individuals with fragile X syndrome

Area of Science:

• Neurodevelopmental Disorders
• Cognitive Psychology
• Genetics

Background:

• Fragile X syndrome (FXS) is a genetic disorder often associated with intellectual disability.
• Working memory (WM) is crucial for cognitive functions, and its deficits are observed in various neurodevelopmental conditions.
• Previous research suggests potential cognitive impairments in FXS, but specific deficits remain under investigation.

Purpose of the Study:

• To investigate the hypothesis that FXS is linked to a working memory deficit.
• To determine if this deficit is exacerbated by increasing task control requirements.
• To explore the role of cognitive control in differentiating WM abilities in FXS.

Main Methods:

• A cohort of 15 boys with FXS and 15 typically developing boys, matched for mental age, participated.
• Participants completed verbal and visuospatial working memory tasks with varying levels of control demands.
• The Logical Operation Test was used for mental age assessment.

Main Results:

• Children with FXS performed comparably to controls on WM tasks with low to medium-low control requirements.
• Significant impairments were observed in the FXS group on WM tasks requiring high levels of control.
• No specific visuospatial deficit associated with FXS was identified.

Conclusions:

• Working memory deficits in FXS are contingent on high cognitive control demands.
• Cognitive control appears to be a critical factor in understanding intellectual differences in FXS.
• The findings do not support a generalized visuospatial deficit in FXS.