Journal
NEUROPSYCHOLOGIA
Volume 124, Issue -, Pages 31-43Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuropsychologia.2018.12.023
Keywords
FMRI; Parietal cortex; Recognition memory; Repetition enhancement; Repetition suppression
Funding
- National Institute of Mental Health at the National Institutes of Health, Division of Intramural Research [ZIAMH002920]
- NATIONAL INSTITUTE OF MENTAL HEALTH [ZIAMH002588] Funding Source: NIH RePORTER
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Studies of human memory have implicated a parietal memory network in the recognition of familiar stimuli. However, the automatic vs. top-down nature of information processing within this network is not yet understood. If the network processes stimuli automatically, one can expect repetition-related changes both when familiarity is central to an ongoing task and when it is task-irrelevant. Here, we tested this prediction in a group of 40 human subjects using fMRI. Subjects initially named 100 objects aloud in the scanner. They then repeated the same task with novel and previously-named objects intermixed (where familiarity was not task-relevant) and separately were asked to make old/new recognition decisions in response to pictures of novel and previously named objects (where familiarity was central to task completion). Accuracy was matched across conditions, and voice reaction times reflected typical behavioral priming effects. Repetition enhancement effects were restricted primarily to parietal cortex and in particular, the parietal memory network and were task-general in nature, whereas repetition suppression effects were task-dependent and occurred primarily in frontal and ventral temporal cortex. Task context effects were also present in the parietal memory network and impacted responses to both novel and familiar items. We conclude by discussing implications of these findings with respect to current hypotheses regarding parietal contributions to memory retrieval.
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