Altered learning from positive feedback in adolescents with anorexia nervosa

Area of Science:

• Neuroscience
• Psychiatry
• Developmental Psychology

Background:

• Anorexia nervosa (AN) involves severe calorie restriction with significant health consequences.
• Previous research suggests impaired feedback learning in individuals with AN.
• The specific nature of this impairment (positive vs. negative feedback) and its relation to illness characteristics remain unclear.

Purpose of the Study:

• To investigate feedback learning differences in adolescents with AN compared to healthy controls.
• To determine if learning deficits involve positive feedback (reward), negative feedback (punishment), or both.
• To explore the association between feedback learning, illness duration, and severity.

Main Methods:

• A probabilistic reinforcement learning task was administered to female adolescents with AN (n=76) and healthy controls (HC; n=38).
• A Bayesian reinforcement learning model quantified separate learning rates for positive and negative feedback.
• Exploratory analyses assessed correlations with illness duration, eating disorder severity, and reward/punishment sensitivity.

Main Results:

• Adolescents with AN demonstrated significantly lower learning rates from positive feedback compared to HC.
• No significant differences were found between AN and HC in learning from negative feedback or overall task performance.
• Feedback learning parameters did not correlate with illness duration, severity, or self/parent-reported sensitivity.

Conclusions:

• Adolescents with AN exhibit a specific deficit in learning from reward, distinct from punishment learning.
• This reward learning impairment is not associated with the duration or severity of the illness.
• Future longitudinal studies are recommended to examine the relationship between positive feedback learning and the course of AN in youth.