Cerebral Cortex, Vol. 11, No. 4, 322-334,
April 2001
© 2001 Oxford University Press
Remembering the Color of Objects: An ERP Investigation of Source Memory
New York State Psychiatric Institute, New York City, NY 10032 and , 1 New York University, New York City, NY 10003, USA
Subjects studied pictures of common objects outlined in either red or green and were asked to memorize the objects and their associated colors. Event-related potentials (ERPs) were recorded during subsequent inclusion (i.e. item) and exclusion (i.e. source) memory tasks. The main goal of the experiment was to determine if brain signatures for familiarity and recollection, two behavioral processes thought to account for episodic memory performance, would be observed in the pattern of ERP results. For correctly recognized items, early, posterior old/new effects were recorded (~300–600 ms) that did not differ in magnitude or scalp distribution between item and source memory tasks. A subsequent long-duration occipitally focused negativity (~800 ms peak) was evident in the source but not the item memory task. The ERPs associated with ‘source errors’ in the source memory task also showed robust early old/new effects. However, ‘source error’ ERPs lacked frontal scalp activity compared to those associated with correct source attribution. The data suggest that a recollective response may require frontal involvement whereas a decision based on familiarity may not.
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