Resting-State Theta Oscillations and Reward Sensitivity in Risk Taking

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• Females generally exhibit higher risk aversion than males, but the neurobiological underpinnings remain largely unknown.
• Understanding sex differences in risk-taking is crucial for various fields, including economics and behavioral science.

Purpose of the Study:

• To investigate the relationship between resting-state theta oscillations and different measures of risk-taking behavior.
• To explore potential neurobiological mechanisms, specifically frontal theta asymmetry and power, underlying sex differences in risk aversion.

Main Methods:

• Magnetoencephalography (MEG) was used to record resting-state brain activity, focusing on theta oscillations (4-7 Hz).
• Participants (N=35, 15 females) completed the Bomb Risk Elicitation Task (BRET), Domain-Specific Risk-Taking Scale (DOSPERT), and Barratt Impulsiveness Scale (BIS11).
• Analysis focused on frontal theta asymmetry, frontal theta power, risk-taking during the BRET, and self-reported risk attitudes and sensitivities.

Main Results:

• Frontal theta asymmetry correlated with risk-taking in females only.
• Frontal theta power correlated with risk-taking and reward/punishment sensitivity in the overall sample.
• Reward sensitivity mediated the link between anterior cingulate cortex theta power and risk-taking.
• Significant sex differences were found in theta power, risk-taking, and reward sensitivity.

Conclusions:

• Resting-state theta oscillations in the anterior cingulate cortex are associated with reward sensitivity.
• Reward sensitivity, modulated by theta oscillations, may be a key factor contributing to sex differences in risk-taking behavior.
• These findings provide neurobiological insights into why females may be more risk-averse than males.