Related Experiment Video
Updated: Jun 18, 2025
13:04
Measuring the Subjective Value of Risky and Ambiguous Options using Experimental Economics and Functional MRI Methods
Published on: September 19, 2012
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Irrational choices via a curvilinear representational geometry for value
Katarzyna Jurewicz1,2, Brianna J Sleezer3, Priyanka S Mehta3,4
1Department of Neurosciences, Faculté de médecine, and Centre interdisciplinaire de recherche sur le cerveau et l'apprentissage, Université de Montréal, Montréal, QC, Canada.
Nature Communications
|July 30, 2024
Summary
Brain value representation is not linear. Researchers found curved geometry in the ventromedial prefrontal cortex (vmPFC) that leads to irrational decision-making, especially with decoy options.
Area of Science:
- Neuroscience
- Cognitive Science
- Decision Science
Background:
- Understanding how the brain represents value is crucial for decision-making.
- Previous models often assumed linear value representation, partly due to a focus on single neurons.
Purpose of the Study:
- To investigate the representational geometry of value in the ventromedial prefrontal cortex (vmPFC).
- To test whether value representation is linear or nonlinear and its implications for decision-making.
Main Methods:
- Examined neural population activity in the vmPFC of two rhesus macaques during decision-making tasks.
- Analyzed the geometric structure of value representations.
Main Results:
- Value is encoded along a curved manifold in the vmPFC, indicating nonlinear representation.
- Observed decision-making behavior consistent with predictions from nonlinear value geometry, including irrational choices influenced by decoy options.
Conclusions:
- The representational geometry of value in the vmPFC is nonlinear.
- This nonlinearity may impose fundamental constraints on rational decision-making processes.
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