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Vol. 60, No. 2, 2009
Issue release date: October 2009
Section title: Original Paper
Neuropsychobiology 2009;60:94–103
(DOI:10.1159/000239685)

Reduced Response to Reward in Smokers and Cannabis Users

Martin-Soelch C. · Kobel M. · Stoecklin M. · Michael T. · Weber S. · Krebs B. · Opwis K.
aDepartment of Psychiatry, University Hospital of Zurich, Zurich, and bDepartment of Psychology, University of Basel, Basel, Switzerland

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 12/12/2008
Accepted: 6/23/2009
Published online: 9/21/2009

Number of Print Pages: 10
Number of Figures: 3
Number of Tables: 3

ISSN: 0302-282X (Print)
eISSN: 1423-0224 (Online)

For additional information: http://www.karger.com/NPS

Abstract

Background: Cannabis is one of the most commonly used illicit drugs. Reduced neural and behavioral reactions to reward have been demonstrated in other forms of addiction, as expressed by reduced mood reactivity and lack of striatal activation to rewards, but this effect has not yet been investigated in cannabis users. Methods: We hypothesized that cannabis users and tobacco smokers would evidence lower positive mood ratings in rewarded conditions than control participants and that this reduction would be greater in cannabis users than in smokers. We examined the influence of reward on mood and performance in a group of regular cannabis users, a group of tobacco smokers and a group of nonsmokers while they performed a spatial recognition task with delayed response that incorporated 3 levels of difficulty. Correct responses were either not reinforced or reinforced with money. We measured the accuracy of reactions, reaction times and mood ratings throughout the trials. Results: Cannabis users rated their mood as significantly worse than the smokers and nonsmokers during the easiest level of the rewarded condition. A significant positive correlation between mood ratings and monetary reward was found in the nonsmokers but not in the cannabis users and smokers. The groups did not differ with regard to task performance. Conclusions: Our results suggest that regular cannabis use affects certain aspects of motivation and that both tobacco smoking and cannabis use lead to similar motivational changes. However, the use of cannabis seems to affect motivation in a stronger way than does tobacco smoking alone.


  

Author Contacts

Chantal Martin-Soelch
Department of Psychiatry, University Hospital of Zurich
Culmannstrasse 8
CH–8091 Zurich (Switzerland)
Tel. +41 44 255 9668, Fax +41 44 255 4408, E-Mail chantal.martinsoelch@usz.ch

  

Article Information

Received: December 12, 2008
Accepted after revision: June 23, 2009
Published online: September 21, 2009
Number of Print Pages : 10
Number of Figures : 3, Number of Tables : 3, Number of References : 61

  

Publication Details

Neuropsychobiology (International Journal of Experimental and Clinical Research in Biological Psychiatry, Pharmacopsychiatry, Biological Psychology/Pharmacopsychology and Pharmacoelectroencephalography)

Vol. 60, No. 2, Year 2009 (Cover Date: October 2009)

Journal Editor: Strik W. (Bern)
ISSN: 0302-282X (Print), eISSN: 1423-0224 (Online)

For additional information: http://www.karger.com/NPS


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 12/12/2008
Accepted: 6/23/2009
Published online: 9/21/2009

Number of Print Pages: 10
Number of Figures: 3
Number of Tables: 3

ISSN: 0302-282X (Print)
eISSN: 1423-0224 (Online)

For additional information: http://www.karger.com/NPS


Copyright / Drug Dosage

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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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