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First impressions play a crucial role in social perception, shaping how individuals assess others in professional, academic, and interpersonal contexts. Psychological research highlights the significance of cognitive biases, such as the primacy and recency effects, which influence how people interpret and recall information.The Primacy Effect and Cognitive AnchoringThe primacy effect describes the tendency for initial information to impact judgment disproportionately. When individuals encounter...
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Insula and striatum mediate the default bias.

Rongjun Yu1, Dean Mobbs, Ben Seymour

  • 1Medical Research Council Cognition and Brain Sciences Unit, Cambridge CB2 7EF, UK. ry223@cam.ac.uk

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Decision Science

Background:

  • Humans exhibit a strong default bias, consistently choosing available default options.
  • The neural mechanisms underlying this default bias remain largely unclear.
  • Understanding this bias is crucial for fields ranging from behavioral economics to public policy.

Purpose of the Study:

  • To investigate the neural basis of the default bias using functional magnetic resonance imaging (fMRI).
  • To explore the emotional and reward-related brain activity associated with choosing or switching from default options.

Main Methods:

  • A novel gambling task was designed to elicit choices between default and non-default options.
  • Functional magnetic resonance imaging (fMRI) was employed to measure brain activity during decision-making and outcome evaluation.
  • Behavioral data on choice tendencies and emotional responses were collected.

Main Results:

  • Participants showed a greater tendency to select the default option.
  • Switching away from the default during decision-making correlated with decreased anterior insula activity.
  • Choosing the default option engaged the ventral striatum, a key reward processing area.
  • Anterior insula activation during "switching away and losing" positively correlated with experienced frustration.

Conclusions:

  • Aversive processes in the anterior insula contribute significantly to the default bias.
  • The act of choosing the default option may be inherently rewarding, engaging the brain's reward system.
  • Findings suggest that the default bias is driven by avoiding negative outcomes associated with switching.