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Self-serving bias is a cognitive phenomenon in which individuals attribute positive outcomes to internal factors such as their abilities, intelligence, or effort while attributing negative outcomes to external circumstances. This cognitive distortion helps maintain self-esteem but can also impede objective self-assessment.Theoretical Explanations of Self-Serving BiasTwo primary theories explain the self-serving bias: the cognitive explanation and the motivational explanation.The cognitive...
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Self-allocation bias in performance-based cooperative decisions is driven by self-interest rather than distorted

Sihui Zhang1,2, Xue Yong1, Yina Ma1,3

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Individuals show a self-allocation bias in cooperative tasks, favoring themselves regardless of their contribution. This bias intensifies when personal performance doesn't impact joint outcomes, revealing self-interest in reward distribution.

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Area of Science:

  • Neuroscience
  • Social Psychology
  • Behavioral Economics

Background:

  • Human cooperation involves joint tasks with reward allocation based on individual performance and contribution.
  • Understanding self-related biases in these allocation decisions is crucial but remains unclear.

Purpose of the Study:

  • To investigate self-related biases in performance-based reward allocation during cooperation.
  • To examine how individual performance contribution influences self-allocation bias.
  • To explore the neural correlates of self-allocation bias.

Main Methods:

  • Developed a novel performance-based social allocation task manipulating individual performance contribution to joint outcomes.
  • Conducted two experiments with participants making reward allocation decisions.
  • Measured social value orientation to assess individualistic preferences.
  • Utilized neuroimaging techniques to examine brain activity during allocation decisions.

Main Results:

  • Participants exhibited a robust self-allocation bias, allocating more rewards to themselves.
  • This bias was pronounced when individual performance did not causally contribute to the joint outcome.
  • Self-allocation bias was amplified in individuals with stronger individualistic social preferences.
  • Neural activity in medial prefrontal cortex, anterior cingulate cortex, insula, and temporoparietal junction (TPJ) correlated with self-relevant allocation decisions.
  • Brain regions including dorsomedial prefrontal cortex, lateral orbitofrontal cortex, and TPJ tracked relative performance variations.

Conclusions:

  • Self-allocation bias in performance-based decisions likely stems from self-interest shaping the use of performance information, not distorted neural encoding.
  • Self-interest influences how contribution-structured performance data is utilized in social allocation choices.
  • Provides a precise account of self-serving behavior emergence in cooperative contexts.