Perceiving Systems Article 2018

Body size estimation of self and others in females varying in BMI

Plos1

Previous literature suggests that a disturbed ability to accurately identify own body size may contribute to overweight. Here, we investigated the influence of personal body size, indexed by body mass index (BMI), on body size estimation in a non-clinical population of females varying in BMI. We attempted to disentangle general biases in body size estimates and attitudinal influences by manipulating whether participants believed the body stimuli (personalized avatars with realistic weight variations) represented their own body or that of another person. Our results show that the accuracy of own body size estimation is predicted by personal BMI, such that participants with lower BMI underestimated their body size and participants with higher BMI overestimated their body size. Further, participants with higher BMI were less likely to notice the same percentage of weight gain than participants with lower BMI. Importantly, these results were only apparent when participants were judging a virtual body that was their own identity (Experiment 1), but not when they estimated the size of a body with another identity and the same underlying body shape (Experiment 2a). The different influences of BMI on accuracy of body size estimation and sensitivity to weight change for self and other identity suggests that effects of BMI on visual body size estimation are self-specific and not generalizable to other bodies.

Author(s): Anne Thaler and Michael N. Geuss and Simone C. Mölbert and Katrin E. Giel and Stephan Streuber and Javier Romero and Michael J. Black and Betty J. Mohler
Journal: PLoS ONE
Volume: 13
Number (issue): 2
Year: 2018
Month: February
Project(s):
Bibtex Type: Article (article)
DOI: 10.1371/journal.pone.0192152
Digital: True
Electronic Archiving: grant_archive
Links:

BibTex

@article{Thaler:PLOS:2018,
  title = {Body size estimation of self and others in females varying in {BMI}},
  journal = {PLoS ONE},
  abstract = {Previous literature suggests that a disturbed ability to accurately identify own body size may
  contribute to overweight. Here, we investigated the influence of personal body size, indexed
  by body mass index (BMI), on body size estimation in a non-clinical population of females
  varying in BMI. We attempted to disentangle general biases in body size estimates and attitudinal
  influences by manipulating whether participants believed the body stimuli (personalized
  avatars with realistic weight variations) represented their own body or that of another
  person. Our results show that the accuracy of own body size estimation is predicted by personal
  BMI, such that participants with lower BMI underestimated their body size and participants
  with higher BMI overestimated their body size. Further, participants with higher BMI
  were less likely to notice the same percentage of weight gain than participants with lower
  BMI. Importantly, these results were only apparent when participants were judging a virtual
  body that was their own identity (Experiment 1), but not when they estimated the size of a
  body with another identity and the same underlying body shape (Experiment 2a). The different
  influences of BMI on accuracy of body size estimation and sensitivity to weight change
  for self and other identity suggests that effects of BMI on visual body size estimation are
  self-specific and not generalizable to other bodies.},
  volume = {13},
  number = {2},
  month = feb,
  year = {2018},
  slug = {thaler-plos-2018},
  author = {Thaler, Anne and Geuss, Michael N. and M\"{o}lbert, Simone C. and Giel, Katrin E. and Streuber, Stephan and Romero, Javier and Black, Michael J. and Mohler, Betty J.},
  month_numeric = {2}
}