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Area of Science:

  • Neuroscience
  • Social Psychology
  • Decision Science

Background:

  • Facial trustworthiness perception influences social approachability decisions.
  • The neural mechanisms underlying trustworthiness learning and its impact on behavior are not fully understood.
  • The amygdala's role in processing trustworthiness and adapting to social contexts requires further investigation.

Purpose of the Study:

  • To investigate the neural underpinnings of approach behavior based on perceived facial trustworthiness.
  • To test whether the amygdala adapts to different trustworthiness ranges.
  • To examine if amygdala responses are modulated by task instructions and social context.

Main Methods:

  • Participants made approachability decisions based on faces with varying trustworthiness.
  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity, focusing on the amygdala.
  • Behavioral data were analyzed to assess adaptation to trustworthiness ranges and social context.

Main Results:

  • Participants demonstrated behavioral adaptation to the range of perceived trustworthiness in faces.
  • Approachability decisions were modulated by the social context.
  • The right amygdala exhibited both linear and quadratic responses to trustworthiness levels.
  • Amygdala response to trustworthiness was not modulated by stimulus range or social context, suggesting neural adaptation.

Conclusions:

  • Behavioral adaptation to trustworthiness ranges is robust.
  • The amygdala plays a key role in approach behavior driven by perceived facial trustworthiness.
  • The amygdala's consistent response suggests a form of neural dynamic adaptation independent of immediate stimulus range or social context.