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Using Neural Data to Test A Theory of Investor Behavior: An Application to Realization Utility.

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Area of Science:

  • Neuroeconomics
  • Behavioral Finance
  • Cognitive Neuroscience

Background:

  • The disposition effect describes investors' tendency to sell winning stocks too early and hold losing stocks too long.
  • Traditional economic models struggle to explain this persistent and often suboptimal investor behavior.

Purpose of the Study:

  • To test the
  • realization utility
  • theory of investor behavior using neuroimaging.
  • To investigate the neural underpinnings of the disposition effect.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity in subjects trading stocks in an experimental market.
  • Neural activity was correlated with trading behavior and potential capital gains/losses.

Main Results:

  • All subjects displayed a disposition effect, even when it was not financially optimal.
  • Activity in the ventromedial prefrontal cortex correlated with potential capital gains.
  • Neural measures of realization utility correlated with individual disposition effect tendencies.
  • The ventral striatum showed increased activity upon realizing capital gains.

Conclusions:

  • The findings support the
  • realization utility
  • model as an explanation for the disposition effect.
  • Neural data provides valuable insights for testing and refining models of investor decision-making.