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The Journal of Neuroscience, January 15, 2002, 22(2):523-528
Dissociable Human Perirhinal, Hippocampal, and Parahippocampal Roles during Verbal Encoding
B. A. Strange1, 2, L. J. Otten2, O. Josephs1, M. D. Rugg1, 2, and R. J. Dolan1, 3 1 Wellcome Department of Cognitive Neurology, Institute of Neurology, London WC1N 3BG, United Kingdom, 2 Institute of Cognitive Neuroscience, London WC1N 3AR, United Kingdom, and 3 Royal Free Hospital School of Medicine, London NW3, United Kingdom
The precise contribution of perirhinal cortex to human episodic memory is uncertain. Human intracranial recordings highlight a role in successful episodic memory encoding, but encoding-related perirhinal activation has not been observed with functional imaging. By adapting functional magnetic resonance imaging scanning parameters to maximize sensitivity to medial temporal lobe activity, we demonstrate that left perirhinal and hippocampal responses during word list encoding are greater for subsequently recalled than forgotten words. Although perirhinal responses predict memory for all words, successful encoding of initial words in a list, demonstrating a primacy effect, is associated with parahippocampal and anterior hippocampal activation. We conclude that perirhinal cortex and hippocampus participate in successful memory encoding. Encoding-related parahippocampal and anterior hippocampal responses for initial, remembered words most likely reflects enhanced attentional orienting to these positionally distinctive items.
Key words: perirhinal cortex; hippocampus; parahippocampal cortex; fMRI; episodic memory encoding; subsequent memory effect; primacy effect
Copyright © 2002 Society for Neuroscience 0270-6474/02/222523-06$05.00/0
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