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Updated: May 19, 2026
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Measuring the Subjective Value of Risky and Ambiguous Options using Experimental Economics and Functional MRI Methods
Published on: September 19, 2012
Oscillatory brain activity correlates with risk perception and predicts social decisions
Pablo Billeke1, Francisco Zamorano, Diego Cosmelli
1Centro Interdisciplinario de Neurociencia.
Cerebral Cortex (New York, N.Y. : 1991)
|September 4, 2012
Summary
Understanding social risk perception is key in decision-making. This study reveals how brainwave activity, specifically alpha and theta oscillations, reflects and regulates our responses to perceived social risk during economic games.
Area of Science:
- Neuroscience
- Social Psychology
- Decision Science
Background:
- Perception of decision risk in social contexts is influenced by anticipating others' actions.
- The ultimatum game provides a framework for studying social decision-making and risk assessment.
Purpose of the Study:
- To investigate the neurobiology underlying the perception of social risk.
- To examine how electroencephalography (EEG) signals correlate with risk assessment in social interactions.
Main Methods:
- Utilized electroencephalography (EEG) to record brain activity in participants acting as proposers in an iterated ultimatum game.
- Employed statistical modeling to differentiate high-risk (HR) and low-risk (LR) offers based on prior player behaviors.
- Analyzed alpha and theta oscillations in relation to offer risk and rejection feedback.
Main Results:
- Rejections of LR offers showed stronger mediofrontal negativity and higher prefrontal theta activity compared to HR offers.
- HR offers were associated with a decrease in alpha activity across an extended neural network prior to feedback.
- Trial-by-trial variations in alpha and theta activity predicted subsequent proposer behavior, indicating sensitivity to social risk.
Conclusions:
- Alpha and theta brainwave oscillations are sensitive indicators of social risk perception.
- These neural oscillations play a crucial role in the fine-tuning and regulation of social decision-making processes.
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