Poster F83, Tuesday, March 28, 8:00 – 10:00 am, Pacific Concourse
Neural correlates of true and false memory vividness
Sarah Kark1, Stephanie Sherman1, Ryan Daley1, Scott Slotnick1, Elizabeth Kensinger1; 1Boston College
Previous work has shown that activity in sensory processing regions can distinguish true from false memories. As with true memories, studies have shown that false memories can be endorsed with high subjective vividness (e.g., Dennis, Bowman, & Vandekar 2012). However, it is not known if activation in sensory processing regions tracks with the phenomenological sense of memory vividness for true memories to a greater extent than false memories. In the current fMRI study, participants studied line-drawings of photos followed by the complete colorful photo. After a 24-hour delay, participants were scanned while they completed a surprise recognition memory test. During test, participants were shown all of the previously studied line-drawings and an equal number of unstudied line-drawings. Participants made a button press to indicate if they thought the line-drawing was new (by pressing the 0 key) or—if they thought it was old—how vivid their memory was on a scale from 1-4. Parametric modulation analyses were conducted to examine how activity in sensory processing regions varied as a function of vividness (1-4 scale) during true and false memory. Regions of occipital-temporal cortex (e.g., lateral occipital cortex, fusiform cortex, and parahippocampal cortex) tracked with subjective memory vividness to a greater extent for true memories than for false memories. Of importance, the parahippocampal cortex activity likely reflected modulation of the parahippocampal place area (PPA). These findings suggest that activation in sensory processing regions can distinguish the phenomenological sense of memory vividness for veridical memories from the same sense for illusory memories.
Topic Area: LONG-TERM MEMORY: Episodic