Poster E46, Monday, March 27, 2:30 – 4:30 pm, Pacific Concourse
Dissociable neural and behavioral patterns of proactive interference for Emotion and Neutral Information in Working Memory
Eda Mizrak1,2, Henrik Singmann3, Ilke Oztekin1; 1Koc University, 2UC Davis, 3University of Zurich
Proactive interference (PI) is the tendency for information learned earlier to interfere with more recently learned information. Recently, we showed that emotional stimuli exhibit a different time course of PI than neutral stimuli (Mizrak, & Oztekin, 2015). In the present study we induced PI by presenting items from the same semantic category over several trials. This results in accumulation of PI and reduces the discriminability of the items in each subsequent trial. We introduced emotional (i.e., disgust) and neutral (i.e., furniture) categories and examined how varying PI affected performance when items were drawn from emotional categories compared to neutral categories. Participants were scanned using functional magnetic resonance imaging (fMRI) performing a 5-item short term recognition task. We modeled responses and corresponding response times with a hierarchical diffusion model and observed dissociable patterns in the control of PI for emotion and neutral trials. Evidence accumulation (i.e., drift rate) decreased linearly for neutral trials as a function of increasing PI, but this decline occurred only at the highest PI level for emotional stimuli. Evidence accumulation decline was accompanied with an increase in parahippocampal regions activation for neutral items while anterior lVLPFC activation mediated the resolution of PI for emotion trials. Our findings, consistent with prior work, suggest that emotion items are more resistant to forgetting due to PI.
Topic Area: EXECUTIVE PROCESSES: Working memory