Cue-elicited craving for marijuana: An fMRI study
by Schacht, Joseph Prosen, Ph.D., UNIVERSITY OF COLORADO AT BOULDER, 2010, 116 pages; 3419508

Abstract:

Cannabis dependence is a growing problem among individuals who use marijuana, the most commonly used illicit drug. While heavy marijuana use clearly precipitates dependence, and marijuana-related cues induce reactions similar to those elicited by other drugs of abuse, the neurobiological basis of cue-elicited craving for marijuana is unknown. Past functional imaging studies of alcohol-, nicotine-, and cocaine-dependent individuals have demonstrated that drug-related cues elicit activation of structures in the mesolimbic dopamine pathway and its ascending projections, including the ventral tegmental area (VTA), ventral striatum, anterior cingulate cortex (ACC), orbitofrontal cortex (OFC), insula, and dorsolateral prefrontal cortex, and these activations correlate positively with increases in subjective craving. This study used functional magnetic resonance imaging (fMRI) to examine the neural correlates of cue-elicited craving for marijuana. While undergoing an fMRI scan, 48 regular marijuana users were presented with marijuana-related and control tactile cues and subsequently rated their craving for marijuana. Whole-brain and region-of-interest analyses revealed that, as compared to the control cue, the marijuana-related cue elicited greater activation in motor and visual areas, bilateral VTA, posterior ACC, right anterior insula, and right lateral OFC. However, activation in these areas was not correlated with subjective craving for marijuana during cue presentation, changes in craving after cue presentation, or participants’ intent to use marijuana. Taken together, these data imply that a marijuana-related cue evokes a pattern of brain activation similar to that elicited by other drug cues, but suggest that this activation may not be associated with conscious craving for marijuana or intent to use it. Implications for further study of cannabis dependence and development of treatment strategies for this disorder are discussed, with the conclusion that amelioration of cue-elicited brain activation may be an index of treatment efficacy.

 
AdviserKent E. Hutchison
SchoolUNIVERSITY OF COLORADO AT BOULDER
SourceDAI/B 71-09, p. , Sep 2010
Source TypeDissertation
SubjectsClinical psychology; Experimental psychology; Physiological psychology
Publication Number3419508
Adobe PDF Access the complete dissertation:
 

» Find an electronic copy at your library.
  Use the link below to access a full citation record of this graduate work:
  http://gateway.proquest.com/openurl%3furl_ver=Z39.88-2004%26res_dat=xri:pqdiss%26rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation%26rft_dat=xri:pqdiss:3419508
  If your library subscribes to the ProQuest Dissertations & Theses (PQDT) database, you may be entitled to a free electronic version of this graduate work. If not, you will have the option to purchase one, and access a 24 page preview for free (if available).

About ProQuest Dissertations & Theses
With over 2.3 million records, the ProQuest Dissertations & Theses (PQDT) database is the most comprehensive collection of dissertations and theses in the world. It is the database of record for graduate research.

The database includes citations of graduate works ranging from the first U.S. dissertation, accepted in 1861, to those accepted as recently as last semester. Of the 2.3 million graduate works included in the database, ProQuest offers more than 1.9 million in full text formats. Of those, over 860,000 are available in PDF format. More than 60,000 dissertations and theses are added to the database each year.

If you have questions, please feel free to visit the ProQuest Web site - http://www.proquest.com - or call ProQuest Hotline Customer Support at 1-800-521-3042.