Poster F137, Tuesday, March 28, 8:00 – 10:00 am, Pacific Concourse
Cautious decision criterion drives widespread fronto-parietal fMRI activity across multiple domains
Evan Layher1, Benjamin O. Turner1, Nicole Marinsek1, Puneeth Chakravarthula1, Anjali Dixit1, Amir H. Meghdadi1, Barry Giesbrecht1, Miguel Eckstein1, Michael Miller1; 1UCSB
Previous recognition memory fMRI studies have revealed that the successful retrieval effect (SRE) contrast (hits > correct rejections) is associated with increased activity across prefrontal and dorsal parietal cortices when people establish a cautious versus lax decision criterion. To better understand the processes underlying the observed fronto-parietal activation, we orthogonally manipulated decision domains (memory and perception), decision criterion, and decision evidence during fMRI. Participants (N=30) viewed images of scenes for 200ms and either made memory judgments by responding ‘old’ (studied) or ‘new’ (unstudied), or perceptual judgments by determining if a human was ‘present’ or ‘absent’ in the scene. Participants were rewarded for correct responses and incentivized to switch between lax and cautious decision criteria by either penalizing a ‘miss’ or ‘false alarm,’ respectively. Memory strength was manipulated by how often a scene was repeated at study, while perceptual strength was determined by the difficulty of finding the human in a scene. In total, there were 8 different mini-blocks (memory vs. perception, cautious vs. lax, and low vs. moderate d’) composed of 16 trials within each of the 8 fMRI scans. The fMRI SRE contrasts in the cautious versus lax conditions revealed widespread activation of fronto-parietal regions for both the memory and perceptual judgments, whereas moderate vs. low d’ comparisons showed little to no differences in either domain. These results suggest that establishing a cautious decision criterion is strongly associated with increased fronto-parietal activity regardless of task domain or the strength of evidence.
Topic Area: THINKING: Decision making