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Effects of the amnesic drug lorazepam on complete and partial information retrieval and monitoring accuracy

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Abstract

Rationale

In Koriat’s accessibility model (Koriat, Psychol Rev, 100:609–639, 1993; Koriat, J Exp Psychol Gen, 124:311–333, 1995), when a person fails to recall a required target, he or she can nevertheless provide some partial information about the target. Moreover, individuals are able to provide feeling-of-knowing (FOK) judgments about the availability of the target in memory. The cues for the FOK evaluations reside in the products of the retrieval process itself. It was shown that the benzodiazepine lorazepam drug induces some impairment of memory.

Objectives

The effects of the amnesic benzodiazepine lorazepam on the total and partial recall of recently learned material and on FOK ratings were investigated in healthy volunteers.

Methods

Twenty-eight healthy volunteers participated in the study: 14 of these received a capsule containing lorazepam (0.038 mg/kg) and 14 a placebo capsule. The material to be learned consisted of four-letter nonsense tetragrams with each letter providing partial information with regard to the four-letter target (Koriat, Psychol Rev, 100:609–639, 1993).

Results

The number of incorrect letters reported was higher for the lorazepam than for the placebo condition. The FOK magnitude was higher for the placebo participants than for the lorazepam participants. The predictive value of FOK for recognition was preserved by the drug.

Conclusion

When studying four-letter nonsense letter strings, lorazepam participants present an impairment of episodic short-term memory and the drug has an effect on FOK estimates but not on the predictive accuracy of the FOK. The accessibility hypothesis of FOK was confirmed in this study and seems to retain some validity even under the effect of an amnesic drug.

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Acknowledgements

This study benefited from a Cognitique grant (no. COG 53B) “Perturbations and recovery of cognitive functions” awarded by the French Ministry of Research. The authors wish to thank Christine Ramana-Keller for technical assistance and Dr. Marie Welsch for undertaking the medical examination of the participants. We wish to thank Asher Koriat and an anonymous reviewer for very helpful comments. We particularly thank Tim Pownall who patiently corrected our English. We also thank the INSERM and CNRS institutions.

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Izaute, M., Bacon, E. Effects of the amnesic drug lorazepam on complete and partial information retrieval and monitoring accuracy. Psychopharmacology 188, 472–481 (2006). https://doi.org/10.1007/s00213-006-0492-2

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  • DOI: https://doi.org/10.1007/s00213-006-0492-2

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