, Volume 140, Issue 3, pp 345–353 | Cite as

An investigation of the effects of benzodiazepine receptor ligands and of scopolamine on conceptual priming

  • K. I. Bishop
  • H. Valerie Curran


Scopolamine and lorazepam both produce anterograde impairments of explicit memory but only lorazepam impairs implicit memory as assessed by perceptual priming tasks. The main aim of the two experiments reported in this article was to determine the effects of these drugs on conceptual priming. Experiment 1 compared the effects of lorazepam (1,2 mg PO) with scopolamine (0.3,0.6 mg SC) and placebo in a study with 60 healthy volunteers. Experiment 2 compared the separate and combined effects of lorazepam (2 mg PO) and flumazenil (2 mg IV) with placebo in a study with 48 healthy volunteers. We found that conceptual priming in category generation tasks was intact following lorazepam in both studies. This preservation of conceptual priming contrasted with lorazepam-induced impairments on explicit memory tasks. In conjunction with previous findings, these results are interpreted as providing further support for the notion that conceptual and perceptual priming are subserved by distinct memory systems, one based on the operations of semantic memory, the other possibly based on a perceptual representation system. That lorazepam impairs perceptual but not conceptual priming suggests that the neurochemical substrates of the two kinds of priming are distinct.

Key words Benzodiazepines Flumazenil Scopolamine Implicit memory Explicit memory Conceptual priming 


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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • K. I. Bishop
    • 1
  • H. Valerie Curran
    • 2
  1. 1.Novartis Pharma AG, Clinical Research, Bldg. S-210.3.23, CH-4002 Basel, SwitzerlandCH
  2. 2.Clinical Health Psychology, University College London, Gower Street, London WC1E 6BT, UKGB

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