Does the experience of ownership over a rubber hand change body size perception in anorexia nervosa patients?

Keizer, Anouk; Smeets, Monique A. M.; Postma, Albert; Elburg, Annemarie van; Dijkerman, H. Chris

doi:10.1016/j.neuropsychologia.2014.07.003

Cited by 103 publications

(168 citation statements)

References 69 publications

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“…Proprioception may also be impaired in AN including right‐left and spatial orientation . Using the Rubber Hand Illusion paradigm, an illusion in which participants experience ownership over a fake object (in the present case a rubber hand), when being stroked, participants with AN exhibited a stronger experience of ownership over the fake object than healthy controls.…”

Section: Discussionmentioning

confidence: 83%

Sensory modulation disorder symptoms in anorexia nervosa and bulimia nervosa: A pilot study

Brand-Gothelf

Parush

Eitan

et al. 2015

Intl J Eating Disorders

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Section: Discussionmentioning

confidence: 83%

Sensory modulation disorder symptoms in anorexia nervosa and bulimia nervosa: A pilot study

Brand-Gothelf

Parush

Eitan

et al. 2015

Intl J Eating Disorders

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“…For example, anorexia nervosa, in which disturbances in body shape and size are key features, is characterised by flexible body representations as evidenced by greater susceptibility to the RHI. Furthermore, induction of the RHI has also been found to alter such disturbances, making body representations more in keeping with correct or veridical body size, and thus highlights the importance of bodily illusions in both clinical assessments as well as potential therapeutic interventions (Keizer et al 2014). …”

Section: Discussionmentioning

confidence: 98%

“…Responsiveness to somatic illusions has previously been found to reflect the nature of underlying bodily distortions in clinical conditions (Thakkar et al 2011; Keizer et al 2014). For example, anorexia nervosa, in which disturbances in body shape and size are key features, is characterised by flexible body representations as evidenced by greater susceptibility to the RHI.…”

Section: Discussionmentioning

confidence: 99%

Changing hands: persistent alterations to body image following brief exposure to multisensory distortions

2017

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The dynamic flexibility of body representation has been highlighted through numerous lines of research that range from clinical studies reporting disorders of body ownership, to experimentally induced somatic illusions that have provided evidence for the embodiment of manipulated representations and even fake limbs. While most studies have reported that enlargement of body parts alters somatic perception, and that these can be more readily embodied, shrunken body parts have not been found to consistently alter somatic experiences, perhaps due to reduced feelings of ownership over smaller body parts. Over two experiments, we aimed to investigate the mechanisms responsible for altered somatic representations following exposure to both enlarged and shrunken body parts. Participants were given the impression that their hand and index finger were either longer or shorter than veridical length and asked to judge veridical finger length using online and offline size estimation tasks, as well as to report the degree of ownership towards the distorted finger and hand representations. Ownership was claimed over all distorted representations of the hand and finger and no differences were seen across ownership ratings, while the online and offline measurements of perceived size demonstrated differing response patterns. These findings suggest that ownership towards manipulated body representations is more bidirectional than previously thought and also suggest differences in perceived body representation with respect to the method of measurement suggesting that online and offline tasks may tap into different aspects of body representation.

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“…Research on body size perception has typically focused on the whole body or particular body parts that might be expected to have distortions, such as the stomach, thighs, or upper arms–areas of the body that tend to be higher in fat content [2–4]. However, since these studies were aimed at understanding distortions that occur in clinical populations, such as those with eating disorders, they have tended to ignore the face (but see [5]).…”

Section: Introductionmentioning

confidence: 99%

Perceived face size in healthy adults

D’Amour

Harris

2017

PLoS ONE

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Perceptual body size distortions have traditionally been studied using subjective, qualitative measures that assess only one type of body representation–the conscious body image. Previous research on perceived body size has typically focused on measuring distortions of the entire body and has tended to overlook the face. Here, we present a novel psychophysical method for determining perceived body size that taps into implicit body representation. Using a two-alternative forced choice (2AFC), participants were sequentially shown two life-size images of their own face, viewed upright, upside down, or tilted 90°. In one interval, the width or length dimension was varied, while the other interval contained an undistorted image. Participants reported which image most closely matched their own face. An adaptive staircase adjusted the distorted image to hone in on the image that was equally likely to be judged as matching their perceived face as the accurate image. When viewed upright or upside down, face width was overestimated and length underestimated, whereas perception was accurate for the on-side views. These results provide the first psychophysically robust measurements of how accurately healthy participants perceive the size of their face, revealing distortions of the implicit body representation independent of the conscious body image.

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Does the experience of ownership over a rubber hand change body size perception in anorexia nervosa patients?

Cited by 103 publications

References 69 publications

Sensory modulation disorder symptoms in anorexia nervosa and bulimia nervosa: A pilot study

Sensory modulation disorder symptoms in anorexia nervosa and bulimia nervosa: A pilot study

Changing hands: persistent alterations to body image following brief exposure to multisensory distortions

Perceived face size in healthy adults

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