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Brain, Vol. 113, No. 3, 581-602, 1990
© 1990 Guarantors of Brain

research-article

RECENCY AND FREQUENCY DISCRIMINATION IN THE AMNESIC PATIENT H. M.

H. J. SAGAR1,2,3,, J. D. E. GABRIELI1,2,2, E. V. SULLIVAN1,2,3 and S. CORKIN1,2

1Department of Brain and Cognitive Sciences Cambridge, Massachusetts 2Clinical Research Center, Massachusetts Institute of Technology Cambridge, Massachusetts 3Department of Neurology, Massachusetts General Hospital Boston, Massachusetts, USA

Correspondence to: Correspondence to: Dr H. J. Sagar, Department of Neurology, Royal Hallamshire Hospital, Sheffield S10 2JF, UK.

Temporal contextual memory and event memory were compared across retention intervals in the patient H.M. who is amnesic following bilateral medial temporal lobectomy. Memory for temporal context was assessed using verbal and nonverbal recency discrimination tasks and a frequency task in which subjects made discriminations between words repeated 1, 3 or 5 times. The tests evaluated event memory under parallel conditions by two-choice content recognition tasks. In both recency and frequency tests, H.M. showed above-chance and often normal temporal contextual memory under conditions of impaired and even chance-level content recognition. These results show that temporal contextual memory does not require intact content recognition and is independent of medial temporal lobe structures. Furthermore, the amnesia of bilateral medial temporal lobe resection does not manifest primary loss of temporal contextual memory.

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Received September 27, 1988. Revised May 17, 1989. Accepted May 24, 1989.

Present addresses: Dr John D.E. Gabrieli, Department of Psychology, Northwestern University, Evanston, Illinois 60208, USA; Dr E.V.Sullivan, Psycchiatry Service (1163A), Veterans Administration Medical Center, 3801 Miranda Ave, palo Alto, California 94304, USA.


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