Can I Recognize My Body's Weight? The Influence of Shape and Texture on the Perception of Self

The goal of this research was to investigate women's sensitivity to changes in their perceived weight by altering the body mass index (BMI) of the participants' personalized avatars displayed on a large-screen immersive display. We created the personalized avatars with a full-body 3D scanner that records the participants' body geometry and texture. We altered the weight of the personalized avatars to produce changes in BMI while keeping height, arm length, and inseam fixed and exploited the correlation between body geometry and anthropometric measurements encapsulated in a statistical body shape model created from thousands of body scans. In a 2 × 2 psychophysical experiment, we investigated the relative importance of visual cues, namely shape (own shape vs. an average female body shape with equivalent height and BMI to the participant) and texture (own photo-realistic texture or checkerboard pattern texture) on the ability to accurately perceive own current body weight (by asking the participant, “Is it the same weight as you?”). Our results indicate that shape (where height and BMI are fixed) had little effect on the perception of body weight. Interestingly, the participants perceived their body weight veridically when they saw their own photo-realistic texture. As compared to avatars with photo-realistic texture, the avatars with checkerboard texture needed to be significantly thinner in order to represent the participants' current weight. This suggests that in general the avatars with checkerboard texture appeared bigger. The range that the participants accepted as their own current weight was approximately a 0.83% to − 6.05% BMI change tolerance range around their perceived weight. Both the shape and the texture had an effect on the reported similarity of the body parts and the whole avatar to the participant's body. This work has implications for new measures for patients with body image disorders, as well as researchers interested in creating personalized avatars for games, training applications, or virtual reality.

[1]  Atsushi Iriki,et al.  Dissociations between the horizontal and dorsoventral axes in body-size perception , 2013, The European journal of neuroscience.

[2]  A. W. Kemp,et al.  Kendall's Advanced Theory of Statistics. , 1994 .

[3]  Heinrich H. Bülthoff,et al.  View-Based Recognition of Faces in Man and Machine: Re-Visiting Inter-Extra-Ortho , 2002, Biologically Motivated Computer Vision.

[4]  M. Rosenberg.  Society and the adolescent self-image , 1966 .

[5]  Dragomir Anguelov,et al.  SCAPE: shape completion and animation of people , 2005, ACM Trans. Graph..

[6]  J. Ingleby,et al.  The influence of methodological differences on the outcome of body size estimation studies in anorexia nervosa. , 1997, The British journal of clinical psychology.

[7]  Felix Wichmann,et al.  The psychometric function: I , 2001 .

[8]  Michael J. Black,et al.  FAUST: Dataset and Evaluation for 3D Mesh Registration , 2014, 2014 IEEE Conference on Computer Vision and Pattern Recognition.

[9]  A. Fallon,et al.  Sex differences in perceptions of desirable body shape. , 1985, Journal of abnormal psychology.

[10]  F. Askevold.  Measuring body image. Preliminary report on a new method. , 1975, Psychotherapy and psychosomatics.

[11]  Giuseppe Riva.  Neuroscience and eating disorders: the role of the medial temporal lobe , 2010 .

[12]  P. Haggard,et al.  Implicit body representations and the conscious body image. , 2012, Acta psychologica.

[13]  Michael J. Black,et al.  Coregistration: Simultaneous Alignment and Modeling of Articulated 3D Shape , 2012, ECCV.

[14]  P. Slade,et al.  Awareness of body dimensions in anorexia nervosa: cross-sectional and longitudinal studies , 1973, Psychological Medicine.

[15]  J. Orbach,et al.  PSYCHOPHYSICAL STUDIES OF BODY-IMAGE. I. THE ADJUSTABLE BODY-DISTORTING MIRROR. , 1964, Archives of general psychiatry.

[16]  F. Vignemont.  Embodiment, ownership and disownership , 2011, Consciousness and Cognition.

[17]  C D Thomas,et al.  A modified video camera for measuring body image distortion: technical description and reliability. , 1984, Psychological medicine.

[18]  H H Bülthoff,et al.  Psychophysical support for a two-dimensional view interpolation theory of object recognition. , 1992, Proceedings of the National Academy of Sciences of the United States of America.

[19]  Peter Thompson,et al.  Applying the Helmholtz illusion to fashion: horizontal stripes won't make you look fatter , 2011, i-Perception.

[20]  D. J. Lee.  Society and the Adolescent Self-Image , 1969 .

[21]  Kathleen M. Robinette,et al.  The CAESAR project: a 3-D surface anthropometry survey , 1999, Second International Conference on 3-D Digital Imaging and Modeling (Cat. No.PR00062).

[22]  S. Grogan.  Body Image: Understanding Body Dissatisfaction in Men, Women and Children , 1998 .

[23]  Hong Yu Wong,et al.  Owning an Overweight or Underweight Body: Distinguishing the Physical, Experienced and Virtual Body , 2014, PloS one.

[24]  D A Brodie,et al.  Reliability measures in distorting body-image. , 1989, Perceptual and motor skills.

[25]  S. Kety,et al.  Genetics of neurological and psychiatric disorders. , 1982, Research publications - Association for Research in Nervous and Mental Disease.

[26]  Mario Aachen,et al.  Body Image Understanding Body Dissatisfaction In Men Women And Children , 2016 .

[27]  Jessica L Doolen,et al.  Parental disconnect between perceived and actual weight status of children: A metasynthesis of the current research , 2009, Journal of the American Academy of Nurse Practitioners.

[28]  P. Schilder.  The Image and Appearance of the Human Body: Studies in the Constructive Energies of the Psyche , 1936 .

[29]  R. Shafran,et al.  Assessment of body size estimation: a review , 2005 .

[30]  T McFarlane,et al.  Eating disorders, dieting, and the accuracy of self-reported weight. , 2001, The International journal of eating disorders.

[31]  Patrick Haggard,et al.  What Is It Like to Have a Body? , 2012 .

[32]  D. Wigboldus,et al.  Thinking big: the effect of sexually objectifying music videos on bodily self-perception in young women. , 2013, Body image.

[33]  M. L. Glucksman,et al.  The Response of Obese Patients to Weight Reduction: A Clinical Evaluation of Behavior , 1968, Psychosomatic medicine.

[34]  M. Kendall,et al.  Kendall's advanced theory of statistics , 1995 .

[35]  P. Haggard,et al.  Body image distortions in healthy adults. , 2013, Acta psychologica.

[36]  Peter Willemsen,et al.  Effects of Stereo Viewing Conditions on Distance Perception in Virtual Environments , 2008, PRESENCE: Teleoperators and Virtual Environments.

[37]  Zygmunt Pizlo,et al.  Shape Perception in Human and Computer Vision: An Interdisciplinary Perspective , 2013 .

[38]  Michael J. Black,et al.  Home 3D body scans from noisy image and range data , 2011, 2011 International Conference on Computer Vision.

[39]  T. F. Cash,et al.  The nature and extent of body-image disturbances in anorexia nervosa and bulimia nervosa: a meta-analysis. , 1997, The International journal of eating disorders.

[40]  G. Riva.  The Key to Unlocking the Virtual Body: Virtual Reality in the Treatment of Obesity and Eating Disorders , 2011, Journal of diabetes science and technology.

[41]  F A Wichmann,et al.  Ning for Helpful Comments and Suggestions. This Paper Benefited Con- Siderably from Conscientious Peer Review, and We Thank Our Reviewers the Psychometric Function: I. Fitting, Sampling, and Goodness of Fit , 2001 .