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Measuring the Subjective Value of Risky and Ambiguous Options using Experimental Economics and Functional MRI Methods
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Published on: September 19, 2012

Individual differences in risk preference predict neural responses during financial decision-making.

Jan B Engelmann1, Diana Tamir

  • 1Department of Psychiatry and Behavioral Sciences, Emory University School of Medicine, 101 Woodruff Circle, Atlanta, GA 30329, USA. jan.engelmann@emory.edu

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|July 7, 2009
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Summary

Brain activity in regions like the anterior cingulate cortex (ACC) and posterior cingulate cortex (PCC) reflects individual risk preferences during decision-making. These brain areas are crucial for subjective valuation and self-referential choices.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Decision Science

Background:

  • Subjective valuations significantly influence decision-making, particularly in scenarios involving risk.
  • Individual differences in risk attitudes (risk-seeking vs. risk-averse) impact choices when expected value is constant.
  • Understanding the neural basis of risk preference is crucial for comprehending decision-making processes.

Purpose of the Study:

  • To investigate the neural correlates of subjective risk valuation during lottery choices.
  • To identify brain regions encoding individual risk preferences (risk-seeking vs. risk-averse attitudes).
  • To examine the temporal dynamics of neural activity across decision-making stages.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity during a risky choice task.
  • Participants made choices between lotteries with constant expected values, allowing subjective preferences to drive decisions.
  • Time-series and conjunction analyses were employed to investigate neural dynamics across decision, anticipation, and outcome phases.

Main Results:

  • Anterior cingulate cortex (ACC), posterior cingulate cortex (PCC), superior frontal gyrus, caudate nucleus, and substantia nigra showed increased activation with selected risk-level.
  • Neural activity correlated with risk-seeking attitudes in frontal and orbitofrontal regions, while risk-averse attitudes correlated with caudate activity.
  • ACC, PCC, and caudate were consistently activated across all decision-making phases (decision, anticipation, outcome).

Conclusions:

  • Subjective risk assessments and individual risk attitudes significantly modulate neural activity during decision-making.
  • The ACC, PCC, and caudate play a consistent role across all phases of subjective valuation in decision-making.
  • These findings highlight the importance of these regions in self-referential subjective valuations during choice.