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British Journal of Anaesthesia, Vol 80, Issue 5 588-593, Copyright © 1998 by The Board of Management and Trustees of the British Journal of Anaesthesia

CLINICAL INVESTIGATIONS

Category generation testing in the search for implicit memory during general anaesthesia

W. J. MacRae, J. M. Thorp and K. Millar
Monklands and Bellshill Hospitals NHS Trust, Monkscourt Avenue, Airdrie, Lanarkshire ML6 OJS; Department of Psychological Medicine, University Academic Centre, Gartnavel Hospital, 1055 Great Western Road, Glasgow G12 0XH

We gave auditory examples of two semantic categories through headphones to 100 surgical patients anaesthetized with propofol and enflurane. This presentation was made during certain stages of the procedure, potentially associated with arousal, and during steady-state anaesthesia. Postoperative review using category generation tests showed successful priming in a pre-induction group but no evidence of implicit memory in the anaesthetized groups. These results suggest that timing an auditory input to coincide with surgical stimulation does not increase the probability of retrieval of information by this type of testing.
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