Temporal discounting (TD), the preference for earlier, smaller rewards over delayed, larger rewards, is a pervasive phenomenon that covaries with Big Five personality traits and Intelligence (IQ). This study provides novel insight by identifying correlates for IQ and Extraversion in the neural representation of TD preferences. An intertemporal choice task was employed, where offers were sequentially presented, distinguishing between one evaluation phase (first offer is presented) and one comparison phase (second offer is presented and values are compared). IQ correlated with responses of caudate nucleus to the subjective values of the offers, suggesting a role of cognitive abilities in modulating reward responses. Extraversion correlated with the strength of functional connectivity of a reward evaluation network centered on ventromedial prefrontal cortex.
Bibliographical noteFunding Information:
This study was supported by a grant to Colin DeYoung from the National Institute on Drug Abuse (NIDA; R03 DA029177-01A1 ) and to Colin DeYoung and Aldo Rustichini from the National Science Foundation ( SES-1061817 ). We thank Matt Paffel and Rachael Grazioplene for their help with subject recruitment and data collection.
- Caudate nucleus
- Decision preference
- Evaluation network
- Functional connectivity
- Temporal discounting