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Past visual experiences weigh in on body size estimation.

Joanna Alexi1,2, Dominique Cleary3, Kendra Dommisse3

  • 1School of Psychological Science, University of Western Australia, Crawley, WA, 6009, Australia. joanna.alexi@research.uwa.edu.au.

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This study introduces the bodyline technique for assessing body size perception. Judgments are influenced by previous images, suggesting an adaptive process in how we perceive body size.

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Area of Science:

  • Cognitive Psychology
  • Perception Science
  • Body Image Research

Background:

  • Body size is a key indicator of physical and mental health.
  • Understanding body size perception is crucial due to links between extreme body sizes and health issues.
  • Existing methods for assessing body size perception have limitations.

Purpose of the Study:

  • To introduce and validate a novel technique, the bodyline, for measuring body size perception.
  • To investigate serial dependencies in the judgment of body size.
  • To model the adaptive mechanisms underlying body size perception.

Main Methods:

  • Developed the 'bodyline' technique, adapted from numberline studies.
  • Recruited 103 young women to judge sequential female body images.
  • Participants positioned a marker on a scale delineated by extreme body size images.

Main Results:

  • Participants accurately judged body sizes with high reliability (average SD < 6%).
  • Judgments showed a bias towards previously viewed body images, indicating serial dependence.
  • The observed serial dependence was accurately predicted by a Kalman-filter ideal-observer model.

Conclusions:

  • The bodyline technique is a reliable method for assessing body size perception.
  • Serial dependence in body size judgment appears to be an adaptive, optimal process.
  • This finding offers insights into the cognitive mechanisms of body image perception.