Mapping anticipatory anhedonia: an fMRI study

Springer Science and Business Media LLC - Tập 13 - Trang 1624-1634 - 2019
Joanna E. Szczepanik1,2, Jessica L. Reed1, Allison C. Nugent1, Elizabeth D. Ballard1, Jennifer W. Evans1, Carl W. Lejuez3, Carlos A. Zarate1
1Section on the Neurobiology and Treatment of Mood Disorders, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, USA
2Division of Translational Research, Extramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, USA
3Department of Psychology, University of Kansas, Lawrence, USA

Tóm tắt

Anhedonia—broadly defined as loss of interest and/or an inability to experience pleasure—is an important feature of several psychiatric disorders. Research into the clinical presentation and neurobiology of this symptom has identified components related to motivation, learning, anticipation, and experience of pleasure as important constructs that inform therapeutic interventions. The experimental study of anhedonia is largely based on incentive processing paradigms, most often with monetary rewards, though studies have also used pleasantness ratings of various stimuli. However, linking an individual’s own system of reinforcers and ability to enjoy them with anhedonia and neural activity remains comparatively under-explored. A previous study of participants with major depressive disorder (MDD) and healthy controls found that activity word ratings correlated with measures of anhedonia, depression, and motivation. The present study collected functional magnetic resonance imaging (fMRI) images in healthy controls while they rated activity words and pictures showing activities in order to identify networks differentially responsive to subjective decisions about the appetitive value of activities. The study sought to measure individually-relevant hedonic capacity as demonstrated by correlations between task measures and anticipatory anhedonia ratings. Ratings of potential pleasure were associated with neural activity in areas previously identified as relevant to pleasure and reward processing, such as anterior and posterior cingulate, middle frontal areas, and dorsal and ventral striatum. Although the study included only healthy controls, the results demonstrate a link between anhedonia measures, behavior, and brain responses and also test a paradigm that could be used to study anhedonia in clinical populations.

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