Research on intertemporal behavior has emphasized trait-like variance. However, recent studies have begun to explore situational factors that affect intertemporal preference. In this study, we examined the associations between emotional primes and both behavior and brain function during intertemporal decision making. Twenty-two participants completed a dual task in which they were required to make intertemporal choices while holding an expressive face in memory. From trial-to-trial, the facial expression varied between three alternatives: (i) fearful, (ii) happy and (iii) neutral. Brain activity was recorded using functional magnetic resonance imaging for 16 participants. Behavioral data indicated that fearful (relative to happy) faces were associated with greater preference for larger but later rewards. During observation of fearful faces, greater signal change was observed in the right dorsolateral prefrontal cortex. During subsequent decision making, the fear prime was associated with greater signal increase in structures including the posterior sector of the anterior cingulate cortex. Individual differences in this activity correlated with the magnitude of the priming effect on behavior. These findings suggest that incidental emotions affect intertemporal choice. Increased farsightedness after the fear prime may be explained by an 'inhibition spillover' effect.
Keywords: fMRI; incidental emotions; inhibition spillover; intertemporal choice.