Temporal discounting predicts risk sensitivity in rhesus macaques.

Area of Science:

• Neuroscience
• Behavioral Economics
• Cognitive Psychology

Background:

• Humans and animals exhibit aversions to uncertainty and a preference for immediate rewards.
• Comorbidities in psychiatric disorders like impulsivity, problem gambling, and addiction suggest a shared underlying mechanism for risk sensitivity and temporal discounting.
• The exact relationship between risk sensitivity and temporal discounting is not well understood.

Purpose of the Study:

• To investigate if risk sensitivity and temporal discounting are manifestations of a common cognitive process.
• To analyze the influence of delayed rewards on decision-making under risk.

Main Methods:

• Two rhesus macaques participated in a visual gambling task.
• The delay between sequential trials was systematically varied.
• Choices between risky and certain options were recorded.

Main Results:

• Preference for the risky option decreased as the delay between trials increased.
• This effect persisted even when other task parameters remained constant.
• A computational model confirmed these findings, linking subjective utility to the expected time of payoff.

Conclusions:

• Risk sensitivity may arise from other cognitive processes, specifically future myopia and the salience of large potential rewards (jackpots).
• The findings suggest that the timing of potential rewards significantly impacts the propensity to engage in risky behavior.
• This research provides a potential unifying framework for understanding impulsivity and related disorders.