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Journal of Psychopharmacology
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Effects of smoking status and schizotypy on latent inhibition

V. Della Casa

I. Höfer

Laboratory of Behavioural Biology and Functional Toxicology, Swiss Federal Institute of Technology Zurich, Schorenstrasse 16, 8603 Schwerzenbach, Switzerland

I. Weiner

Department of Psychology, Tel-Aviv University, Ramat-Aviv, Tel-Aviv 69978, Israel

J. Feldon

Laboratory of Behavioral Biology and Functional Toxicology, Swiss Federal Institute of Technology Zurich, Schorenstrasse 16, CH-8603 Schwerzenbach, Switzerland feldon{at}toxi.biol.ethz.ch

Two experiments investigated the effects of smoking status and schizotypy on the ability to gate out irrelevant information as assessed in auditory and visual latent inhibition (LI), Stroop effect and negative priming.The two experiments used 10 or 30 pre-exposures for auditory LI and a long or short interstimulus interval for the Stroop task, respectively, which included negative priming and served as masking task for the visual LI. Smoking status did not affect performance on any of the tasks, except for auditory LI after 30 pre-exposures, which was enhanced. The relationship between schizotypy and cognitive performance was complex. In Experiment 1, high schizotypals had smaller visual LI and negative priming than low schizotypals, whereas in Experiment 2 the reverse was observed, namely, larger LI and negative priming in high schizotypals.

Key Words: attention • latent inhibition • negative priming • nicotine • physiology • schizophrenia • schizotypy • smoking • Stroop effect

Journal of Psychopharmacology, Vol. 13, No. 1, 45-57 (1999)
DOI: 10.1177/026988119901300106
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