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Published on: December 7, 2018
Reduced Affiliative Behavior in Autism Reflects Greater Dependence on Perceived Similarity.
Yu Hao1,2,3,4,5,6, Alessandra Yu2,5,6, Sarah Banker7
1Department of Psychology, Ningbo University, Ningbo, Zhejiang, China.
Autism restructures social motivation, not reduces it. Autistic individuals prioritize similar others more strongly, amplifying similarity
Area of Science:
- Neuroscience
- Psychology
- Autism Research
Background:
- Social difficulties in autism are often attributed to reduced social motivation.
- This perspective fails to explain the specific conditions under which autistic individuals seek affiliation.
- Understanding the nuances of social affiliation in autism is crucial for accurate theoretical models.
Purpose of the Study:
- To investigate the role of similarity in social affiliation among autistic and neurotypical adults.
- To determine if autism alters the presence or the architecture of similarity-based social behavior.
- To explore the neural underpinnings of similarity-affiliation coupling in autism.
Main Methods:
- Two independent samples (online N=714, in-person N=225) of autistic and neurotypical adults were recruited.
- Participants' context-dependent preferences for similar others were assessed.
- Structural MRI scans were used to examine brain volumes (hippocampus, posterior cingulate cortex) and their relation to similarity-affiliation coupling.
Main Results:
- Autistic and neurotypical adults showed similar context-dependent preferences for similar others.
- Autistic individuals exhibited a stronger coupling between perceived similarity and affiliation, with low similarity leading to sharply reduced affiliation.
- This effect was more pronounced in individuals with lower trait empathy; hippocampal and posterior cingulate cortex volumes correlated with this coupling.
Conclusions:
- Autism preserves the attraction to similarity but amplifies its influence on social engagement.
- Social motivation in autism is characterized by a restructured, similarity-dependent engagement rather than a general deficit.
- Findings support a revised model of social motivation in autism, highlighting altered heuristics for social interaction.

