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Reward activity in satiated overweight women is decreased during unbiased viewing but increased when imagining taste: an event-related fMRI study

International Journal of Obesity volume 36, pages 627–637 (2012)Cite this article

Abstract

Objective:

The aim of this functional magnetic resonance imaging (fMRI) study was to investigate reward-related brain activity in satiated overweight and healthy-weight participants in response to high-calorie palatable food pictures, when viewing the pictures without prior instructions (called unbiased viewing) versus imagining the taste of the shown pictures (called taste imagination). We predicted that neural activation in brain reward regions would be greater in overweight participants than in healthy-weight ones and that this difference between groups would be strongest during unbiased viewing.

Method:

Neural activation was measured using fMRI in 14 overweight (mean body mass index (BMI): 29.8 kg m−2) and 15 healthy-weight (mean BMI: 21.1 kg m−2) participants who were satiated, in response to palatable and unpalatable high-calorie and low-calorie food pictures, presented in an event-related design during two conditions: unbiased viewing (no prior instructions) versus taste imagination.

Results:

A group × condition interaction was found in 14 brain regions involved in food reward processing during the presentation of high-calorie palatable food stimuli. During the taste imagination condition, neural activation in these regions was greater in the overweight participants than in the healthy-weight ones. Contrary to our expectations, the opposite pattern was observed during unbiased viewing: activation in reward regions in the overweight participants was reduced compared with the healthy-weight ones. In all brain reward regions except for the left amygdala, the group × condition interaction was specific to high-calorie palatable food stimuli.

Conclusion:

Greater reward activity in the overweight participants compared with the control group when imagining taste may represent an increased reward response induced by high-calorie palatable food. During unbiased viewing, reduced reward activation in the overweight participants compared with those with a healthy weight may reflect avoidance of high-calorie palatable food stimuli. Taken together, this pattern of activation may reflect ambivalence in the overweight group between desire for (in the taste imagination condition) and avoidance of (in the unbiased viewing condition) high-calorie palatable food stimuli.

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Acknowledgements

We thank Charlie Bonnemayer of Maastricht University for his help in programming the stimulus protocol in E-Prime, Dr Armin Heinecke of Brain Innovation B.V. for his help with the data analysis and Dr Samantha Brooks for proofreading of the manuscript. This study was financed by the Netherlands Research Organization (NWO) grant number 400.06.148, awarded to Anita Jansen.

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Authors and Affiliations

  1. Department of Clinical Psychological Science, Faculty of Psychology and Neuroscience, Maastricht University, Maastricht, The Netherlands

    A Frankort, A Roefs, N Siep, R Havermans & A Jansen

  2. Department of Cognitive Neuroscience, Faculty of Psychology and Neuroscience, Maastricht University, Maastricht, The Netherlands

    A Roebroeck

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Correspondence to A Frankort.

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Frankort, A., Roefs, A., Siep, N. et al. Reward activity in satiated overweight women is decreased during unbiased viewing but increased when imagining taste: an event-related fMRI study. Int J Obes 36, 627–637 (2012). https://doi.org/10.1038/ijo.2011.213

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