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Changes in brain activity related to eating chocolate: From pleasure to aversion
Abstract
We performed successive H(2)(15)O-PET scans on volunteers as they ate chocolate to beyond satiety. Thus, the sensory stimulus and act (eating) were held constant while the reward value of the chocolate and motivation of the subject to eat were manipulated by feeding. Non-specific effects of satiety (such as feelings of fullness and autonomic changes) were also present and probably contributed to the modulation of brain activity. After eating each piece of chocolate, subjects gave ratings of how pleasant/unpleasant the chocolate was and of how much they did or did not want another piece of chocolate. Regional cerebral blood flow was then regressed against subjects' ratings. Different groups of structures were recruited selectively depending on whether subjects were eating chocolate when they were highly motivated to eat and rated the chocolate as very pleasant [subcallosal region, caudomedial orbitofrontal cortex (OFC), insula/operculum, striatum and midbrain] or whether they ate chocolate despite being satiated (parahippocampal gyrus, caudolateral OFC and prefrontal regions). As predicted, modulation was observed in cortical chemosensory areas, including the insula and caudomedial and caudolateral OFC, suggesting that the reward value of food is represented here. Of particular interest, the medial and lateral caudal OFC showed opposite patterns of activity. This pattern of activity indicates that there may be a functional segregation of the neural representation of reward and punishment within this region. The only brain region that was active during both positive and negative compared with neutral conditions was the posterior cingulate cortex. Therefore, these results support the hypothesis that there are two separate motivational systems: one orchestrating approach and another avoidance behaviours.
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“Similarly, ventral striatal activity is initially high in response to palatable food but diminishes as individuals consume beyond satiety225.”
From Neural mechanisms of social homeostasis (2019) · cites this paper as [225]
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Metadata
- Authors
- Small, D. M.
- Affiliations
- Northwestern University (US)
- Corresponding author
- Small, D. M.
- ORCID
- Small, D. M.
- Venue
- Brain
- Publisher
- Oxford University Press (OUP)
- Published
- 2001-09-01
- Volume
- 124
- Issue
- 9
- Pages
- 1720-1733
- ISSN
- 0006-8950 (ISSN-L)
- 1460-2156
- OpenAlex
- W2243948722
- Cited by
- 1,179
- References
- 91
- Citations by year
- 2026: 14 · 2025: 30 · 2024: 19 · 2023: 39 · 2022: 22 · 2021: 37 · 2020: 71 · 2019: 40 · 2018: 40 · 2017: 54 · 2016: 56 · 2015: 52 · 2014: 55 · 2013: 55 · 2012: 77
- FWCI
- 10.96
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Brain (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
- Keywords
- chocolate consumption, food reward, satiety, food aversion, insula, striatum, midbrain, parahippocampal gyrus, posterior cingulate cortex, approach-avoidance motivation, regional cerebral blood flow, chemosensory processing
- MeSH terms
- Avoidance Learning, Brain, Cacao, Cerebrovascular Circulation, Feeding Behavior, Female, Humans, Male, Reward, Satiety Response, Taste, Tomography, Emission-Computed
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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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