Poster Session E, Monday, March 25, 2:30 – 4:30 pm, Pacific Concourse
EEG Correlates of Involuntary Cognitions from External Control
Alexander J. Cook1, Wei Dou1, Ezequiel Morsella1,2, Mark W. Geisler1; 1San Francisco State University, 2University of California, San Francisco
The Reflexive Imagery Task (RIT; Allen et al., 2013) reveals that the activation of action sets can result in involuntary cognitions that are triggered by external stimuli. In the basic RIT, participants are presented with an image of an object (e.g., CAT) and instructed to not think of the name of the object. Involuntary subvocalizations of the name (the RIT effect) arise on roughly 80% of the trials. We conducted two EEG studies to explore the neural correlates of the RIT effect. In Study 1, subjects (n = 8) were presented with one object at a time in one condition and two objects simultaneously in another condition. Four regions were defined by electrode sites: frontal (F3-F4), parietal (P3-P4), right hemisphere (F4-P4), and left hemisphere (F3-P3). In Study 2, we investigated the Two-object condition of Study 1. In this variant of the RIT, participants, before being presented with the two objects, decide which object (the one on the left or on the right) to not think the name of. For Study 1, a 4 (Regions) × 2 (One-Object condition vs. Two-Object condition) repeated-measures ANOVA of alpha coherence showed a significant main effect of Region, F(3, 21) = 70.90, p < .001, with significant differences in alpha correlation between frontal (M = 1.35), parietal (M = 0.95), right hemisphere (M = 0.65), and left hemisphere (M = 0.59), ts(15) > 6.00, ps < .001, but no contrast between left and right hemispheres, t(15) = 0.76, p = .23.
Topic Area: EXECUTIVE PROCESSES: Monitoring & inhibitory control