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  Slave to habit? Obesity is associated with decreased behavioural sensitivity to reward devaluation

Horstmann, A., Dietrich, A., Mathar, D., Poessel, M., Villringer, A., & Neumann, J. (2015). Slave to habit? Obesity is associated with decreased behavioural sensitivity to reward devaluation. Appetite, 87, 175-183. doi:10.1016/j.appet.2014.12.212.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-6051-F Version Permalink: http://hdl.handle.net/21.11116/0000-0003-78FA-D
Genre: Journal Article

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 Creators:
Horstmann, Annette1, 2, 3, Author              
Dietrich, Anja2, Author              
Mathar, David1, 2, Author              
Poessel, Maria2, 3, Author              
Villringer, Arno1, 2, 3, 4, 5, Author              
Neumann, Jane1, 2, 3, Author              
Affiliations:
1Integrated Research and Treatment Center Adiposity Diseases, University of Leipzig, Germany, ou_persistent22              
2Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, Leipzig, DE, ou_634549              
3Collaborative Research Center Obesity Mechanisms, Institute of Biochemistry, University of Leipzig, Germany, ou_persistent22              
4Clinic for Cognitive Neurology, University of Leipzig, Germany, ou_persistent22              
5Berlin School of Mind and Brain, Humboldt University Berlin, Germany, ou_persistent22              

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Free keywords: Obesity; Reward sensitivity; Goal-directed; Habitual; Devaluation; Motivation; Control of food intake
 Abstract: The motivational value of food is lower during satiety compared to fasting. Dynamic changes in motivational value promote food seeking or meal cessation. In obesity this mechanism might be compromised since obese subjects ingest energy beyond homeostatic needs. Thus, lower adaptation of eating behaviour with respect to changes in motivational value might cause food overconsumption in obesity. To test this hypothesis, we implemented a selective satiation procedure to investigate the relationship between obesity and the size of the behavioural devaluation effect in humans. Lean to obese men (mean age 25.9, range 19-30 years; mean BMI 29.1, range 19.2-45.1 kg/m2) were trained on a free operant paradigm and learned to associate cues with the possibility to win different food rewards by pressing a button. After the initial training phase, one of the rewards was devalued by consumption. Response rates for and wanting of the different rewards were measured pre and post devaluation. Behavioural sensitivity to reward devaluation, measured as the magnitude of difference between pre and post responses, was regressed against BMI. Results indicate that (1) higher BMI compared to lower BMI in men led to an attenuated behavioural adjustment to reward devaluation, and (2) the decrease in motivational value was associated with the decrease in response rate between pre and post. Change in explicitly reported motivational value, however, was not affected by BMI. Thus, we conclude that high BMI in men is associated with lower behavioural adaptation with respect to changes in motivational value of food, possibly resulting in automatic overeating patterns that are hard to control in daily life.

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Language(s): eng - English
 Dates: 2014-09-292014-12-212014-12-242015-04-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.appet.2014.12.212
PMID: 25543077
Other: Epub 2014
 Degree: -

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Title: Appetite
Source Genre: Journal
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Pages: - Volume / Issue: 87 Sequence Number: - Start / End Page: 175 - 183 Identifier: ISSN: 0195-6663
CoNE: https://pure.mpg.de/cone/journals/resource/954922648093