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Autism Spectrum Disorder01:19

Autism Spectrum Disorder

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Autism spectrum disorder (ASD) is a neurodevelopmental condition marked by persistent deficits in social communication and interaction alongside restrictive and repetitive behaviors or interests. ASD is sometimes accompanied by intellectual impairment.
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The similarity-dissimilarity effect, a fundamental concept in social psychology, explains how interpersonal similarities and differences influence attraction and social interactions. This effect is supported by three key psychological perspectives: balance theory, social comparison theory, and consensual validation.Balance Theory and Cognitive ConsistencyBalance theory, developed by Fritz Heider, posits that individuals seek cognitive consistency in their relationships. When two people share...
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The need for affiliation is a fundamental human motive that drives individuals to form and maintain interpersonal relationships. This universal drive varies in intensity among individuals due to genetic predispositions and life experiences, shaping it into a relatively stable personality trait. Social inclusion enhances emotional well-being by fulfilling the need for affiliation, whereas social exclusion leads to distress, negative emotions, and cognitive impairments.Psychological and Emotional...
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The similarity hypothesis suggests that individuals are more likely to form relationships with others who share similar attitudes, beliefs, values, and interests. This concept has been widely studied in social psychology, demonstrating that perceived similarity fosters interpersonal attraction. In an experiment supporting this hypothesis, participants were presented with fabricated information indicating that strangers held attitudes similar to their own. The results showed that participants...
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Related Experiment Video

Updated: Apr 18, 2026

Comparing Eye-tracking Data of Children with High-functioning ASD, Comorbid ADHD, and of a Control Watching Social Videos
05:32

Comparing Eye-tracking Data of Children with High-functioning ASD, Comorbid ADHD, and of a Control Watching Social Videos

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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.

Research Square
|April 17, 2026
PubMed
Summary

Autism restructures social motivation, not reduces it. Autistic individuals prioritize similar others more strongly, amplifying similarity

Keywords:
autism spectrum disorderempathyhippocampusposterior cingulate cortexsimilarity attraction

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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.