Neural Mechanisms Underlying Hyperphagia in Prader‐Willi Syndrome
Open accessAbstract
Objective: Prader‐Willi syndrome (PWS) is a genetic disorder associated with developmental delay, obesity, and obsessive behavior related to food consumption. The most striking symptom of PWS is hyperphagia; as such, PWS may provide important insights into factors leading to overeating and obesity in the general population. We used functional magnetic resonance imaging to study the neural mechanisms underlying responses to visual food stimuli, before and after eating, in individuals with PWS and a healthy weight control (HWC) group. Research Methods and Procedures: Participants were scanned once before (pre‐meal) and once after (post‐meal) eating a standardized meal. Pictures of food, animals, and blurred control images were presented in a block design format during acquisition of functional magnetic resonance imaging data. Results: Statistical contrasts in the HWC group showed greater activation to food pictures in the pre‐meal condition compared with the post‐meal condition in the amygdala, orbitofrontal cortex, medial prefrontal cortex (medial PFC), and frontal operculum. In comparison, the PWS group exhibited greater activation to food pictures in the post‐meal condition compared with the pre‐meal condition in the orbitofrontal cortex, medial PFC, insula, hippocampus, and parahippocampal gyrus. Between‐group contrasts in the pre‐ and post‐meal conditions confirmed group differences, with the PWS group showing greater activation than the HWC group after the meal in food motivation networks. Discussion: Results point to distinct neural mechanisms associated with hyperphagia in PWS. After eating a meal, the PWS group showed hyperfunction in limbic and paralimbic regions that drive eating behavior (e.g., the amygdala) and in regions that suppress food intake (e.g., the medial PFC).
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Holsen et al. found a group × time interaction, reflecting increased activation in orbitofrontal cortex, medial prefrontal cortex, and insula at post-meal relative to pre-meal in the PWS groups that was not evident in the control group.
“They found a group × time interaction, reflecting the increased activation in orbitofrontal cortex, medial prefrontal cortex, and insula at post-meal relative to pre-meal in the PWS groups that was not evident in the control group.”
From Reward circuitry dysfunction in psychiatric and neurodevelopmental disorders and genetic syndromes: animal models and clinical findings (2012) · cites this paper as [679]
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- Authors
- Holsen, L. M., Zarcone, J. R., Brooks, W. M., Butler, M. G., Thompson, T. I., Ahluwalia, J. S., Nollen, N. L., & Savage, C. R.
- Affiliations
- University of Wisconsin–Madison (US)
- University of Rochester Medicine (US)
- University of Kansas Medical Center (US)
- Children's Mercy Hospital (US)
- University of Minnesota (US)
- Corresponding author
- Savage, Cary R.
- ORCID
- Venue
- Obesity
- Publisher
- Wiley
- Published
- 2006-06
- Volume
- 14
- Issue
- 6
- Pages
- 1028-1037
- ISSN
- 1930-7381 (ISSN-L)
- 1930-739X
- OpenAlex
- W2088174182
- Cited by
- 189
- References
- 51
- Citations by year
- 2026: 4 · 2025: 13 · 2024: 6 · 2023: 8 · 2022: 10 · 2021: 8 · 2020: 2 · 2019: 9 · 2018: 5 · 2017: 8 · 2016: 7 · 2015: 11 · 2014: 10 · 2013: 10 · 2012: 17
- FWCI
- 3.23
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Obesity (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Hall Family Foundation
- National Institutes of Health (1k25eb003860-01a1)
- National Institute of Neurological Disorders and Stroke (NS39123, R01NS039123)
- National Institute of Biomedical Imaging and Bioengineering (1 K25EB003860-01A1, K25 EB003860)
- National Institute of Child Health and Human Development
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD41672, R01HD041672)
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
- Social Sciences › Psychology › Clinical Psychology › Eating Disorders and Behaviors
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Syndromes and Imprinting
- Keywords
- Prader-Willi syndrome, hyperphagia, food motivation, dietary habits, amygdala, orbitofrontal cortex, medial prefrontal cortex, limbic system, paralimbic regions
- MeSH terms
- Adolescent, Adult, Body Weight, Brain, Brain Mapping, Child, Feeding Behavior, Female, Food, Humans, Hyperphagia, Magnetic Resonance Imaging, Male, Motivation, Photic Stimulation, Prader-Willi Syndrome, Radiography, Satiety Response, Case-Control Studies, Postprandial Period
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