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Measuring the Subjective Value of Risky and Ambiguous Options using Experimental Economics and Functional MRI Methods
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Neural basis of economic bubble behavior.

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  • 1Laboratory for Symbolic Cognitive Development, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.

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Summary

Economic bubbles emerge when traders abandon rational expectations. Brain imaging reveals distinct neural networks, including the dorsolateral prefrontal cortex (DLPFC) and inferior parietal lobule (IPL), active during speculative trading, potentially explaining bubble formation and market busts.

Keywords:
functional MRIfunctional connectivityinferior parietal lobuleprefrontal cortexpremotor areatime perspective

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Area of Science:

  • Neuroscience
  • Behavioral Economics
  • Financial Markets

Background:

  • Economic bubbles, characterized by prices deviating from intrinsic value, challenge rational economic models.
  • Understanding the neural underpinnings of trading behavior during bubble conditions is crucial for explaining market dynamics.

Purpose of the Study:

  • To investigate the neural basis of trading behavior during the formation and potential bursting of economic bubbles.
  • To identify brain regions and networks involved in decision-making under conditions of market uncertainty and speculative pricing.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed while participants engaged in virtual stock trading.
  • Participants traded in a simulated market with non-bubble and bubble stocks, with specified fair prices for comparison.

Main Results:

  • The premotor cortex activated when prices significantly deviated from fair value.
  • Brain regions associated with cognitive decision-making, including the ventrolateral and dorsolateral prefrontal cortex (DLPFC), were active during bubble trading.
  • Activity in the inferior parietal lobule (IPL) correlated with future time perspective, influencing price estimations.
  • Enhanced functional connectivity between the DLPFC and IPL was observed specifically during the bubble condition.

Conclusions:

  • Uncertain and unstable market conditions alter traders' brain activity patterns.
  • Distinct neural networks, particularly involving the DLPFC and IPL, are implicated in bubble dynamics.
  • These neural mechanisms may contribute to wishful thinking, loss of control, and the eventual collapse of economic bubbles.