Poster C99, Sunday, March 26, 5:00 – 7:00 pm, Pacific Concourse
Goal-invariant and goal-dependent retrieval success effects during conceptual and perceptual episodic recollection
Joseph P. Hennessee1, Anthony D. Wagner2, Jesse Rissman1; 1University of California, Los Angeles, 2Stanford University
Upon re-encountering a previously studied stimulus, a variety of conceptual and perceptual details about the original study episode can be brought back to mind. While it is well documented that an extensive network of frontoparietal regions reliably show elevated activity during successful retrieval, the degree to which these retrieval success effects are modulated by retrieval goals remains a topic of active investigation. We collected fMRI data from 21 participants as they were alternatively cued to make recollective judgments about conceptual or perceptual details of past encounters with object stimuli. Each object had been initially encoded under one of two orienting tasks (naturalness or pleasantness judgments) and one of two screen sizes (large or small). Analyses revealed a core set of regions showing comparable retrieval success effects during both conceptual and perceptual retrieval trials, including left anterior inferior frontal sulcus, intraparietal sulcus (IPS), supplementary motor area, and bilateral precuneus and caudate. Retrieval success effects specific to conceptual recollection were observed across a large swath of left ventrolateral PFC, as well as along the lateral bank of left IPS extending ventrally into angular gyrus. Effects specific to perceptual recollection were observed bilaterally along the medial bank of IPS, as well as in dorsal occipital cortex and lateral inferior temporal cortex. These goal-dependent retrieval success effects could not be solely attributed to retrieval orientation, as they were not observed when contrasting conceptual and perceptual correct rejections. Thus, distinct networks of activation are associated with the recovery and/or monitoring of goal-relevant mnemonic content.
Topic Area: LONG-TERM MEMORY: Episodic