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Biol Psychiatry. 2015 Apr 1;77(7):642-52. doi: 10.1016/j.biopsych.2014.09.024. Epub 2014 Oct 22.

Hunger does not motivate reward in women remitted from anorexia nervosa.

Author information

1
Department of Psychiatry, University of California San Diego, San Diego, California.
2
Departments of Neurobiology and Anatomy and Psychiatry, University of Rochester Medical Center, Rochester, New York.
3
Department of Psychology, Stanford University, Stanford, California.
4
Department of Psychiatry, University of California San Diego, San Diego, California. Electronic address: wkaye@ucsd.edu.

Abstract

BACKGROUND:

Hunger enhances sensitivity to reward, yet individuals with anorexia nervosa (AN) are not motivated to eat when starved. This study investigated brain response to rewards during hunger and satiated states to examine whether diminished response to reward could underlie food restriction in AN.

METHODS:

Using a delay discounting monetary decision task known to discriminate brain regions contributing to processing of immediate rewards and cognitive control important for decision making regarding future rewards, we compared 23 women remitted from AN (RAN group; to reduce the confounding effects of starvation) with 17 healthy comparison women (CW group). Monetary rewards were used because the rewarding value of food may be confounded by anxiety in AN.

RESULTS:

Interactions of Group (RAN, CW) × Visit (hunger, satiety) revealed that, for the CW group, hunger significantly increased activation in reward salience circuitry (ventral striatum, dorsal caudate, anterior cingulate cortex) during processing of immediate reward, whereas satiety increased activation in cognitive control circuitry (ventrolateral prefrontal cortex, insula) during decision making. In contrast, brain response in reward and cognitive neurocircuitry did not differ during hunger and satiety in the RAN group. A main effect of group revealed elevated response in the middle frontal gyrus for the RAN group compared with the CW group.

CONCLUSIONS:

Women remitted from AN failed to increase activation of reward valuation circuitry when hungry and showed elevated response in cognitive control circuitry independent of metabolic state. Decreased sensitivity to the motivational drive of hunger may explain the ability of individuals with AN to restrict food when emaciated. Difficulties in valuating emotional salience may contribute to inabilities to appreciate the risks inherent in this disorder.

KEYWORDS:

Anorexia nervosa; Decision making; Delay discounting; Eating disorders; Functional MRI; Reward processing

PMID:
25481622
PMCID:
PMC4359668
DOI:
10.1016/j.biopsych.2014.09.024
[Indexed for MEDLINE]
Free PMC Article

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