Response Inhibition and Interference Suppression in Individuals With Down Syndrome Compared to Typically Developing...

Area of Science:

• Cognitive Psychology
• Developmental Psychology
• Neuroscience

Background:

• Inhibition is crucial for cognitive development.
• Previous studies on inhibition in Down syndrome (DS) yielded inconsistent results due to varied methodologies.
• A theoretical framework is needed to understand inhibition in DS.

Purpose of the Study:

• To investigate response inhibition and interference suppression in individuals with DS.
• To compare inhibitory performance between DS and typically developing (TD) children.
• To examine developmental changes in inhibition during the transition to school.

Main Methods:

• Three groups participated: DS (N=32, mean age 14y 4m), 5-year-old TD (5TD, N=35), and 6-year-old TD (6TD, N=30).
• Confirmatory factor analysis identified response inhibition and interference suppression.
• ANOVA compared inhibitory scores across groups, controlling for fluid intelligence.

Main Results:

• The 6TD group outperformed the 5TD group in both inhibition components.
• No significant difference was found between the DS group and the 5TD group.
• The 6TD group significantly outperformed the DS group in both response inhibition and interference suppression.

Conclusions:

• Response inhibition and interference suppression improve significantly during the transition to school.
• Individuals with DS exhibit a developmental delay in both response inhibition and interference suppression.
• The inhibitory performance of individuals with DS is comparable to younger, typically developing 5-year-olds.