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Diminished size-weight illusion in anorexia nervosa: evidence for visuo-proprioceptive integration deficit

Identifieur interne : 000356 ( PascalFrancis/Corpus ); précédent : 000355; suivant : 000357

Diminished size-weight illusion in anorexia nervosa: evidence for visuo-proprioceptive integration deficit

Auteurs : Laura K. Case ; Rachel C. Wilson ; Vilayanur S. Ramachandran

Source :

RBID : Pascal:12-0125556

Descripteurs français

English descriptors

Abstract

Individuals with anorexia nervosa (AN) experience pronounced body image distortion in combination with a pernicious desire to maintain a dangerously low body weight. Relatively little is known, however, about the mechanism underlying body image distortion in AN. Despite having normal visual perception, individuals with AN both feel and see themselves as large-bodied and show deficits in interoception and haptic perception, suggesting a potential deficit in visual and tactile integration. The size- weight illusion (SWI) arises when two objects of equal weight but different sizes are held. Typical individuals experience a strong and robust illusion that the smaller object feels much heavier than the larger object because of an implicit assumption that weight scales with size. The current study compared the strength of the SWI in individuals with AN to healthy control participants. Individuals with AN exhibited a markedly reduced SWI relative to controls, even though their ability to discriminate weight was unaffected. Because the SWI is strongly modulated by visual appearance, we believe our finding reflects decreased integration of visual and proprioceptive information in anorexia. This finding may explain the puzzling observation that visual perception of the body in a mirror does not correct an AN patient's distorted body image. We speculate that methods to correct visuo-proprioceptive integration in constructing body image may help rehabilitate patients' judgments of size and weight regarding their own bodies. We also suggest that a dysfunction in interactions between inferior parietal lobule (concerned with body image), insula, and hypothalamus may underlie AN.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A08 01  1  ENG  @1 Diminished size-weight illusion in anorexia nervosa: evidence for visuo-proprioceptive integration deficit
A11 01  1    @1 CASE (Laura K.)
A11 02  1    @1 WILSON (Rachel C.)
A11 03  1    @1 RAMACHANDRAN (Vilayanur S.)
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C01 01    ENG  @0 Individuals with anorexia nervosa (AN) experience pronounced body image distortion in combination with a pernicious desire to maintain a dangerously low body weight. Relatively little is known, however, about the mechanism underlying body image distortion in AN. Despite having normal visual perception, individuals with AN both feel and see themselves as large-bodied and show deficits in interoception and haptic perception, suggesting a potential deficit in visual and tactile integration. The size- weight illusion (SWI) arises when two objects of equal weight but different sizes are held. Typical individuals experience a strong and robust illusion that the smaller object feels much heavier than the larger object because of an implicit assumption that weight scales with size. The current study compared the strength of the SWI in individuals with AN to healthy control participants. Individuals with AN exhibited a markedly reduced SWI relative to controls, even though their ability to discriminate weight was unaffected. Because the SWI is strongly modulated by visual appearance, we believe our finding reflects decreased integration of visual and proprioceptive information in anorexia. This finding may explain the puzzling observation that visual perception of the body in a mirror does not correct an AN patient's distorted body image. We speculate that methods to correct visuo-proprioceptive integration in constructing body image may help rehabilitate patients' judgments of size and weight regarding their own bodies. We also suggest that a dysfunction in interactions between inferior parietal lobule (concerned with body image), insula, and hypothalamus may underlie AN.
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Format Inist (serveur)

NO : PASCAL 12-0125556 INIST
ET : Diminished size-weight illusion in anorexia nervosa: evidence for visuo-proprioceptive integration deficit
AU : CASE (Laura K.); WILSON (Rachel C.); RAMACHANDRAN (Vilayanur S.)
AF : Center for Brain and Cognition, University of California, McGill Hall, 9500 Gilman Drive #0109, La Jolla/San Diego, CA 92093-0109/Etats-Unis (1 aut., 2 aut., 3 aut.)
DT : Publication en série; Niveau analytique
SO : Experimental brain research; ISSN 0014-4819; Coden EXBRAP; Allemagne; Da. 2012; Vol. 217; No. 1; Pp. 79-87; Bibl. 1 p.1/4
LA : Anglais
EA : Individuals with anorexia nervosa (AN) experience pronounced body image distortion in combination with a pernicious desire to maintain a dangerously low body weight. Relatively little is known, however, about the mechanism underlying body image distortion in AN. Despite having normal visual perception, individuals with AN both feel and see themselves as large-bodied and show deficits in interoception and haptic perception, suggesting a potential deficit in visual and tactile integration. The size- weight illusion (SWI) arises when two objects of equal weight but different sizes are held. Typical individuals experience a strong and robust illusion that the smaller object feels much heavier than the larger object because of an implicit assumption that weight scales with size. The current study compared the strength of the SWI in individuals with AN to healthy control participants. Individuals with AN exhibited a markedly reduced SWI relative to controls, even though their ability to discriminate weight was unaffected. Because the SWI is strongly modulated by visual appearance, we believe our finding reflects decreased integration of visual and proprioceptive information in anorexia. This finding may explain the puzzling observation that visual perception of the body in a mirror does not correct an AN patient's distorted body image. We speculate that methods to correct visuo-proprioceptive integration in constructing body image may help rehabilitate patients' judgments of size and weight regarding their own bodies. We also suggest that a dysfunction in interactions between inferior parietal lobule (concerned with body image), insula, and hypothalamus may underlie AN.
CC : 002B17A01; 002A25E
FD : Illusion perceptive; Proprioception; Perception visuelle; Perception corporelle; Hypothalamus; Lobe pariétal; Homme; Perception haptique
FG : Encéphale; Système nerveux central
ED : Perceptual illusion; Proprioception; Visual perception; Body perception; Hypothalamus; Parietal lobe; Human; Haptic perception
EG : Encephalon; Central nervous system
SD : Ilusión perceptiva; Propiocepción; Percepción visual; Percepción corporal; Hipotálamo; Lóbulo parietal; Hombre
LO : INIST-12535.354000502856500090
ID : 12-0125556

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Pascal:12-0125556

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<AF>Center for Brain and Cognition, University of California, McGill Hall, 9500 Gilman Drive #0109, La Jolla/San Diego, CA 92093-0109/Etats-Unis (1 aut., 2 aut., 3 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Experimental brain research; ISSN 0014-4819; Coden EXBRAP; Allemagne; Da. 2012; Vol. 217; No. 1; Pp. 79-87; Bibl. 1 p.1/4</SO>
<LA>Anglais</LA>
<EA>Individuals with anorexia nervosa (AN) experience pronounced body image distortion in combination with a pernicious desire to maintain a dangerously low body weight. Relatively little is known, however, about the mechanism underlying body image distortion in AN. Despite having normal visual perception, individuals with AN both feel and see themselves as large-bodied and show deficits in interoception and haptic perception, suggesting a potential deficit in visual and tactile integration. The size- weight illusion (SWI) arises when two objects of equal weight but different sizes are held. Typical individuals experience a strong and robust illusion that the smaller object feels much heavier than the larger object because of an implicit assumption that weight scales with size. The current study compared the strength of the SWI in individuals with AN to healthy control participants. Individuals with AN exhibited a markedly reduced SWI relative to controls, even though their ability to discriminate weight was unaffected. Because the SWI is strongly modulated by visual appearance, we believe our finding reflects decreased integration of visual and proprioceptive information in anorexia. This finding may explain the puzzling observation that visual perception of the body in a mirror does not correct an AN patient's distorted body image. We speculate that methods to correct visuo-proprioceptive integration in constructing body image may help rehabilitate patients' judgments of size and weight regarding their own bodies. We also suggest that a dysfunction in interactions between inferior parietal lobule (concerned with body image), insula, and hypothalamus may underlie AN.</EA>
<CC>002B17A01; 002A25E</CC>
<FD>Illusion perceptive; Proprioception; Perception visuelle; Perception corporelle; Hypothalamus; Lobe pariétal; Homme; Perception haptique</FD>
<FG>Encéphale; Système nerveux central</FG>
<ED>Perceptual illusion; Proprioception; Visual perception; Body perception; Hypothalamus; Parietal lobe; Human; Haptic perception</ED>
<EG>Encephalon; Central nervous system</EG>
<SD>Ilusión perceptiva; Propiocepción; Percepción visual; Percepción corporal; Hipotálamo; Lóbulo parietal; Hombre</SD>
<LO>INIST-12535.354000502856500090</LO>
<ID>12-0125556</ID>
</server>
</inist>
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