Abstract:
Impulsive decisions arise from preferring smaller but sooner rewards compared to larger but later rewards. How neural activity and attention to choice alternatives contribute to reward decisions during temporal discounting is not clear. Here we probed (i) attention to and (ii) neural representation of delay and reward information in humans (both sexes) engaged in choices. We studied behavioral and frequency specific dynamics supporting impulsive decisions on a fine-grained temporal scale using eye tracking and magnetoencephalographic (MEG) recordings. In one condition participants had to decide for themselves but pretended to decide for their best friend in a second prosocial condition, which required perspective taking. Hence, conditions varied in the value for themselves versus that pretending to choose for another person. Stronger impulsivity was reliably found across three independent groups for prosocial decisions. Eye tracking revealed a systematic shift of attention from the delay to the reward information and differences in eye tracking between conditions predicted differences in discounting. High frequency activity (HFA: 175-250 Hz) distributed over right fronto-temporal sensors correlated with delay and reward information in consecutive temporal intervals for high value decisions for oneself but not the friend. Collectively the results imply that the HFA recorded over fronto-temporal MEG sensors plays a critical role in choice option integration.
Authors:
Stefan Dürschmid
Andre Maric
Marcel S Kehl
Robert T Knight
Hermann Hinrichs
Hans-Jochen Heinz
Date: 2020
DOI: https://doi.org/10.1523/JNEUROSCI.1196-20.2020