Reduced reward‐related neural response to mimicry in individuals with autism

Mimicry is a facilitator of social bonds in humans, from infancy. This facilitation is made possible through changing the reward value of social stimuli; for example, we like and affiliate more with people who mimic us. Autism spectrum disorders (ASD) are marked by difficulties in forming social bonds. In this study, we investigate whether the reward‐related neural response to being mimicked is altered in individuals with ASD, using a simple conditioning paradigm. Multiple studies in humans and nonhuman primates have established a crucial role for the ventral striatal (VS) region in responding to rewards. In this study, adults with ASD and matched controls first underwent a conditioning task outside the scanner, where they were mimicked by one face and ‘anti‐mimicked’ by another. In the second part, participants passively viewed the conditioned faces in a 3T MRI scanner using a multi‐echo sequence. The differential neural response towards mimicking vs. anti‐mimicking faces in the VS was tested for group differences as well as an association with self‐reported autistic traits. Multiple regression analysis revealed lower left VS response to mimicry (mimicking > anti‐mimicking faces) in the ASD group compared to controls. The VS response to mimicry was negatively correlated with autistic traits across the whole sample. Our results suggest that for individuals with ASD and high autistic traits, being mimicked is associated with lower reward‐related neural response. This result points to a potential mechanism underlying the difficulties reported by many of individuals with ASD in building social rapport.

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