Affect Modulated Startle Response in Anorexia Nervosa, Restricting Type: Implications for Theory and Practice.

Area of Science:

• Psychology
• Neuroscience
• Clinical Psychology

Background:

• Individuals with anorexia nervosa (AN), restricting type, exhibit distinct emotional processing patterns.
• Emotional responses to positive stimuli, beyond those directly related to eating disorders (ED), are not fully understood in AN.

Purpose of the Study:

• To investigate differences in emotional responses to various positive stimuli among acutely ill AN (IAN), weight-recovered AN (WRAN), and healthy controls (HCs).
• To utilize affect modulated startle response (AMSR) as an objective measure of hedonic response.

Main Methods:

• Recruited 28 female participants aged 8-18: 14 IAN, 7 WRAN, and 7 HCs.
• Employed the AMSR paradigm, presenting standardized negative, neutral, and positive stimuli, alongside ED-related stimuli (food, body image, success, relationships).

Main Results:

• No significant group differences in startle response to ED-related stimuli were observed; all groups showed inhibited responses.
• Both IAN and WRAN groups displayed reduced hedonic responses to standardized, non-ED positive stimuli compared to HCs.
• Reduced hedonic response to non-ED stimuli correlated with higher social anxiety, lower self-esteem, body dissatisfaction, and interpersonal difficulties.

Conclusions:

• Anorexia nervosa patients exhibit blunted hedonic responses to general positive stimuli, linked to anxiety-related traits.
• Automatic responses to ED-specific stimuli (food, body image, success, relationships) did not differ between AN patients and controls.
• These findings suggest that AN patients may evaluate ED-related stimuli differently, possibly as highly interesting or positive.