Painfully thin but locked inside a fatter body: abnormalities in both anticipation and execution of action in anorexia nervosa

BMC Research Notes

Marion Luyat³  Olivier Cottencin¹  Gilles Lafargue³  Michel Guerraz⁴  Ines Bauwens¹  Dewi Guardia²  Morgane Metral⁴ 

[1] Addiction Center, CHRU Fontan2 (Regional University Hospital), F-59000 Lille, France;Adolescent Mental Health Center, Lautreamont Clinic, F-59120 Loos, France;Department of Psychology, University of Lille 3, F-59650 Villeneuve d’Ascq, France;LPNC (Laboratory of Psychology and Neurocognition), UMR5105, F-73000 Chambéry, France

关键词: Body-scaled action;    Body image;    Body schema;    Motor imagery;    Body representation;    Anorexia nervosa;   

Others  :  1127300
DOI  :  10.1186/1756-0500-7-707

 received in 2014-09-11, accepted in 2014-10-02,  发布年份 2014

【 摘 要 】

Background

People with anorexia nervosa (AN) usually report feeling broader than they really are. The objective of the present study was to better understand the body schema's involvement in this false self-representation in AN. We tested the potential for correction of the body schema impairment via the sensorimotor feedback provided by a real, executed action and relative to an imagined action. We also took account of the impact of the AN patients’ weight variations on the task outcomes.

Methods

Fourteen inpatient participants with AN and fourteen control participants were presented with a doorway-like aperture. The participants had to (i) judge whether or not various apertures were wide enough for them to pass through in a motor imagery task and then (ii) actually perform the action by passing through various apertures.

Results

We observed a higher passability ratio (i.e. the ratio between the critical aperture size and shoulder width) in participants with AN (relative to controls) for both motor imagery and real action. Moreover, the magnitude of the passability ratio was positively correlated with weight recovery.

Conclusion

The body schema alteration in AN appears to be strong enough to affect the patient's actions. Furthermore, the alteration resists correction by the sensorimotor feedback generated during action. This bias is linked to weight variations. The central nervous system might be locked to a false representation of the body that cannot be updated. Moreover, these results prompt us to suggest that emotional burden during weight recovery could also alter sensorimotor aspects of body representation. New therapeutic methods should take account of body schema alterations in AN as adjuncts to psychotherapy.

【 授权许可】

   
2014 Metral et al.; licensee BioMed Central Ltd.

【 图 表 】

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