Poster D39, Monday, March 26, 8:00-10:00 am, Exhibit Hall C
Behavioral oscillations in multi-item visual working memory
Jingtai Liu1, Taosheng Liu1, Susan Ravizza1; 1Michigan State University
Neural oscillations play an important role in various aspects of working memory. Although previous researchers have reported correlations between brain oscillations and behavior, surprisingly, direct evidence for behavioral oscillations in working memory is still lacking. Motivated by previous studies which used a high time-resolved psychophysical measurement and found compelling oscillatory patterns in attention, our study examined if this rhythmic pattern also exists in working memory. In this task, participants memorized orientations of two Gabor patches followed by a retro-cue with different probabilities (i.e. 100%, and 50%) indicating the likelihood that the orientation would have to be recalled. Our results showed a performance increase in the predictive condition (i.e. 100%) than the non-predictive condition (i.e. 50%). In the non-predictive condition, participants performed better on cued condition than uncued condition. These results suggested that the retro-cue could effectively modulate memory performance by directing internal attention to cued items. More importantly, we observed compelling rhythmic patterns, mainly in the delta band, between 1-4 Hz in the behavioral time course. This finding revealed direct evidence of the dynamic nature of working memory maintenance and provided a direct connection with behavior.
Topic Area: EXECUTIVE PROCESSES: Working memory