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Testing visual self-misperception in anorexia nervosa using a symmetrical body size estimation paradigm.

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Women with anorexia nervosa (AN) overestimate their body size, but this is not solely due to visual misperception. A new symmetrical body size estimation (s-BSE) paradigm suggests response bias significantly influences these estimates.

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Area of Science:

  • Psychology
  • Cognitive Neuroscience
  • Eating Disorders Research

Background:

  • Individuals with anorexia nervosa (AN) frequently report a distorted perception of their body size, often perceiving themselves as overweight.
  • Previous research using body size estimation tasks indicates overestimation, but the underlying cause—visual misperception versus response bias—remains unclear.

Purpose of the Study:

  • To differentiate between visual misperception and response bias in body size overestimation in women with AN.
  • To introduce and validate the symmetrical body size estimation (s-BSE) paradigm as a novel method for this distinction.

Main Methods:

  • The study employed the s-BSE paradigm, comparing a conventional task (adjusting a rectangle to body width) with a transposed task (adjusting body width to a rectangle).
  • Participants included women diagnosed with AN (n=14) and a control group of women without eating disorders (n=40).

Main Results:

  • Both AN and control groups overestimated body size in the conventional task, replicating prior findings.
  • In the transposed task, participants with AN significantly adjusted their body photographs to appear wider, indicating a response bias rather than solely visual misperception.

Conclusions:

  • The findings challenge the exclusive role of visual misperception in body size overestimation among women with AN.
  • Results suggest a significant contribution of response bias to body size misestimation in both AN and control groups.
  • The s-BSE paradigm offers a valuable tool for future research to isolate non-perceptual influences on body size estimations.