Related Experiment Video
Updated: Jun 17, 2026
11:16
Progressive-ratio Responding for Palatable High-fat and High-sugar Food in Mice
Published on: May 3, 2012
Excessive appetitive arousal in Prader-Willi syndrome.
E C Hinton1, A R Isles, N M Williams
1Wales Institute of Cognitive Neuroscience, School of Psychology, Cardiff University, Park Place, Cardiff CF103AT, UK. hintone@cardiff.ac.uk
Appetite
|December 17, 2009
Summary
Individuals with Prader-Willi syndrome (PWS) exhibit non-specific appetitive arousal to food cues, unlike controls. This suggests over-activation of the motivation system may stem from the genetic disorder.
Area of Science:
- Neuroscience
- Genetics
- Behavioral Science
Background:
- Appetitive arousal is a key component of eating motivation.
- Prader-Willi syndrome (PWS) is a genetic disorder characterized by hyperphagia (excessive eating).
- Understanding the motivation to eat in PWS is crucial for managing the condition.
Purpose of the Study:
- To investigate the elicitation of appetitive arousal through food-associated stimuli in individuals with PWS.
- To compare the behavioral responses to motivational stimuli between individuals with PWS and controls.
- To explore the role of the anticipatory motivation system in PWS.
Main Methods:
- A computerised response task was administered to participants with PWS and control groups.
- Participants were exposed to motivational stimuli, including food-associated cues.
- Behavioral responses and arousal patterns were recorded and analyzed.
Main Results:
- Control participants displayed specific appetitive arousal patterns, linked to particular stimuli.
- Individuals with PWS demonstrated a non-specific pattern of appetitive arousal.
- The findings indicate a difference in how food cues elicit motivation between PWS patients and controls.
Conclusions:
- Over-activation of the anticipatory motivation system may be a consequence of the genetic disorder in PWS.
- The non-specific arousal in PWS suggests a dysregulation in the motivation to eat.
- Further research into the neural mechanisms underlying PWS is warranted.
Related Concept Videos
01:30Regulation of Food Intake
Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
01:23Binge Eating Disorders
Binge eating disorder is a significant mental health condition characterized by recurrent episodes of excessive food consumption within a short period, accompanied by a perceived loss of control over eating behavior. Unlike occasional overeating, binge eating disorder is marked by distressing emotions such as guilt, shame, and anxiety following binge episodes. The disorder affects individuals across different ages and backgrounds, with profound implications for physical and psychological...
01:23Optimal Arousal Theory
The optimal arousal theory suggests that performance is maximized when an individual experiences a moderate level of arousal. This theory is closely tied to the Yerkes-Dodson law, which illustrates an inverted U-shaped relationship between arousal and performance. The law, formulated by psychologists Robert Yerkes and John Dodson, implies an ideal arousal level for optimal performance, and deviations from this level can lead to declines in effectiveness.
Inverted U-Shaped Performance Curve
The...
Inverted U-Shaped Performance Curve
The...
01:28Anorexia Nervosa
Anorexia nervosa is a complex and severe eating disorder characterized by an intense fear of weight gain, an unrelenting pursuit of thinness, and a distorted body image. It often leads to dangerously low body weight relative to an individual's age and height. This disorder is marked by significant physical and psychological consequences, making it one of the most life-threatening psychiatric illnesses.
Symptoms and Physical Effects
Individuals with anorexia nervosa commonly exhibit extreme...
Symptoms and Physical Effects
Individuals with anorexia nervosa commonly exhibit extreme...
01:14Conditioned Taste Aversion
Conditioned taste aversion, also known as sauce béarnaise syndrome, is a phenomenon in which an individual develops an aversion to a certain food taste following a negative experience, typically illness. This form of aversion is a type of classical conditioning in which the taste of the food (conditioned stimulus, CS) is associated with the experience of illness (unconditioned stimulus, UCS).
A notable characteristic of conditioned taste aversion is that it often requires only a single exposure...
A notable characteristic of conditioned taste aversion is that it often requires only a single exposure...
01:30Bulimia Nervosa
Bulimia nervosa is a complex and severe eating disorder characterized by a cyclical pattern of binge-and-purge eating pattern. It generally involves an episode of binge eating, followed by compensatory behaviors such as vomiting, excessive exercise, laxative use, or fasting, to prevent weight gain. Despite often maintaining a normal weight, individuals with bulimia are intensely preoccupied with their body image and harbor an overwhelming fear of gaining weight. This can contribute to the...