Individual differences in feedback processing during value acquisition may be linked to future behaviour
Sucheta Chakravarty1, Isha Ober1, Christopher R. Madan2, Yvonne Y. Chen3, Esther Fujiwara1, Jeremy B. Caplan1; 1University of Alberta, 2University of Nottingham, 3Baylor College of Medicine
Previously (CNS 2017) we reported elicitation of two spontaneous strategies among human participants while handling an unanticipated change in previously learned item-value relationships. One third of participants (N=21) responded based on their previous knowledge of value (“conservative”) while another third (N=19) appeared to guess randomly (“exploratory”). We found that feedback locked ERPs during this reversal phase differed significantly between the two strategy groups; the exploratory strategy used prediction error as indexed by the FRN; measured by averaged amplitude from the fronto-central electrode FCz in the time window of 200-300~ms., while conservative strategy showed no trace of FRN. The two strategy groups did not differ in learning performance during value acquisition, neither did one strategy re-learned the reversed values better than the other. Given the difference in ERPs during the reversal phase, here we asked if the the two strategies may be associated with difference in feedback processing during the value acquisition phase. Supporting our hypothesis, a significant difference due to strategy was found for feedback locked ERPs during value learning. The conservative strategy exhibited an early large component while the exploratory strategy revealed a large late component, suggesting a possible difference in feedback processing among these two groups.
Topic Area: EXECUTIVE PROCESSES: Other