Altered tactile processing in children with autism spectrum disorder.

Area of Science:

• Neuroscience
• Developmental Psychology
• Biomarkers

Background:

• Tactile reactivity issues are common in autism spectrum disorder (ASD), but underlying mechanisms remain unclear.
• Reduced feed-forward inhibition is a proposed mechanism contributing to ASD symptoms.

Purpose of the Study:

• To investigate tactile processing and feed-forward inhibition in children with ASD compared to typically developing (TD) children.
• To explore the potential of tactile thresholds as a biomarker for ASD and treatment response.

Main Methods:

• Assessed static and dynamic tactile thresholds in 42 children (21 ASD, 21 TD) as a proxy for gamma-aminobutyric acid (GABA)-mediated feed-forward inhibition.
• Calculated the ratio between dynamic and static thresholds to quantify inhibition levels.

Main Results:

• Children with ASD exhibited marginally higher static tactile thresholds and a significantly lower dynamic/static threshold ratio compared to TD children.
• The lower ratio in ASD children suggests reduced feed-forward inhibition.
• Static thresholds correlated with autism spectrum quotient scores, while reduced inhibition correlated with repetitive behavior scores.

Conclusions:

• Children with ASD demonstrate altered tactile processing, indicative of potentially reduced neural inhibition.
• Measuring static and dynamic tactile thresholds could serve as a potential biomarker for ASD.
• This measurement may aid in predicting treatment response for therapies targeting the GABAergic system.