Poster B34, Sunday, March 25, 8:00-10:00 am, Exhibit Hall C
ERP Components Related to Proactive Interference in Visual Working Memory
Li Zhou1, Thomas Farnbacher2, Robin Thomas2; 1Bemidji State University, 2Miami University
Previous studies have showed that visual working memory (VWM) likes verbal working memory is subject to proactive interference (PI). A small set of ERP research have investigated ERP activities for PI in verbal working memory, however few have studied that in VWM. In our study, we adopted recent-probe paradigm with colored squares as stimuli, and recorded twenty-three college students’ ERP activities when the size of memory array was below and around VWM capacity. The response time difference between recent and non-recent negative probe suggested that participants experienced proactive interferences during the task. The ERP results showed that late positive component (LPC) reflected the difference between recent and non-recent negative probe, which suggested LPC is the ERP signature related to proactive interference resolution in VWM. In addition, we observed different scalp distributions of LPC difference related to recency manipulation for the two memory load conditions. When memory load was below VWM capacity, LPC difference distributed at parietal lobe, whereas, it moved to frontal-central area when memory load was up to VWM capacity. The results suggested that we may have different control mechanism for PI resolution corresponding to different memory conditions.
Topic Area: EXECUTIVE PROCESSES: Other