Reduced task-dependent modulation of functional network architecture for positive versus negative affective touch...

Area of Science:

• Neuroscience
• Psychology
• Developmental Disorders

Background:

• Autism spectrum disorder (ASD) is characterized by social communication deficits and often involves atypical responses to tactile stimuli.
• Understanding the neural basis of abnormal touch processing in ASD is crucial given the role of touch in social interaction.

Purpose of the Study:

• To investigate the neural mechanisms of atypical touch processing in adults with ASD.
• To compare functional brain connectivity patterns in response to pleasant and unpleasant touch stimuli between neurotypical individuals and those with ASD.

Main Methods:

• Functional neuroimaging (fMRI) was used to examine brain activity in male adults with and without ASD during tactile stimulation.
• Generalized psychophysiological interaction (PPI) analysis and independent component analysis (ICA) were employed to assess stimulus-dependent functional connectivity.

Main Results:

• Neurotypical individuals exhibited significant stimulus-sensitive modulations in brain network architecture for both pleasant and unpleasant touch.
• Individuals with ASD showed markedly fewer stimulus-sensitive network modulations, indicating aberrant functional connectivity.
• Specific findings in ASD included hypo-connectivity in the parietal operculum and pain networks, and hyper-connectivity between semantic and limbic networks.

Conclusions:

• Reduced modulation of functional brain networks in response to tactile stimuli is associated with abnormal touch processing in ASD.
• Hyper-connectivity between limbic and semantic networks correlated with greater social deficits and negative attitudes towards social touch in the ASD group.
• These findings highlight the importance of network-level alterations in understanding sensory processing differences in autism spectrum disorder.