Atypical activation of the mirror neuron system during perception of hand motion in autism

Area of Science:

• Neuroscience
• Developmental Psychology
• Autism Spectrum Disorder Research

Background:

• Autism spectrum disorders (ASD) are characterized by social and communication deficits.
• The mirror neuron system (MNS) is implicated in social cognition, imitation, and empathy.
• Atypical MNS function is hypothesized to contribute to social impairments in ASD.

Purpose of the Study:

• To investigate the role of the mirror neuron system (MNS) in individuals with autism spectrum disorder (ASD).
• To compare brain activation patterns during observation and execution of hand movements between autistic and typically developing individuals.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to study seven high-functioning autistic males and eight typically developing (TD) controls.
• Participants observed and executed hand movements, contrasted with a resting state.
• Between-group analysis focused on brain activation during the observation versus rest condition.

Main Results:

• The autism spectrum disorder (ASD) group exhibited significantly greater bilateral activation of the inferior frontal gyrus during observation of hand movements compared to the TD group.
• This hyperactivation was specifically noted in the pars opercularis, a key component of the mirror neuron system (MNS).
• Results indicate atypical MNS activity in autistic individuals during the observation of human motion.

Conclusions:

• The findings provide strong support for the hypothesis of atypical mirror neuron system (MNS) activity in autism spectrum disorder (ASD).
• Hyperactivation of the MNS during observation of human motion in autistic subjects may underlie core social deficits.
• This research highlights the potential of targeting MNS function for understanding and potentially treating social impairments in ASD.