Campione Giovanna Cristina, Mansi Gianluigi, Fumagalli Alessandra, Fumagalli Beatrice, Sottocornola Simona, Molteni Massimo, Micali Nadia
Child Psychopathology Unit, Scientific Institute, IRCCS Eugenio Medea, Bosisio Parini, Italy.
Eating and Weight Disorders Program, Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, United States of America.
PLoS One. 2017 Nov 1;12(11):e0187342. doi: 10.1371/journal.pone.0187342. eCollection 2017.
Body representation disturbances in body schema (i.e. unconscious sensorimotor body representations for action) have been frequently reported in eating disorders. Recently, it has been proposed that body schema relies on adequate functioning of the motor system, which is strongly implicated in discriminating between one's own and someone else's body. The present study aimed to investigate the motor-based bodily self in eating disorders and controls, in order to examine the role of the motor system in body representation disturbances at the body schema level.
Female outpatients diagnosed with eating disorders (N = 15), and healthy controls (N = 18) underwent a hand laterality task, in which their own (self-stimuli) and someone else's hands (other-stimuli) were displayed at different orientations. Participants had to mentally rotate their own hand in order to provide a laterality judgement. Group differences in motor-based bodily self-recognition-i.e. whether a general advantage occurred when implicitly processing self- vs. other-stimuli - were evaluated, by analyzing response times and accuracy by means of mixed ANOVAs.
Patients with eating disorders did not show a temporal advantage when mentally rotating self-stimuli compared to other-stimuli, as opposed to controls (F(1, 31) = 5.6, p = 0.02; eating disorders-other = 1092 ±256 msec, eating disorders-self = 1097±254 msec; healthy controls-other = 1239±233 msec, healthy controls -self = 1192±232 msec).
This study provides initial indication that high-level motor functions might be compromised as part of body schema disturbances in eating disorders. Further larger investigations are required to test motor system abnormalities in the context of body schema disturbance in eating disorders.
身体图式（即用于行动的无意识感觉运动身体表征）中的身体表征障碍在饮食失调中经常被报道。最近，有人提出身体图式依赖于运动系统的正常运作，而运动系统在区分自己和他人的身体方面起着重要作用。本研究旨在调查饮食失调患者和对照组中基于运动的身体自我，以检验运动系统在身体图式水平的身体表征障碍中的作用。
被诊断为饮食失调的女性门诊患者（N = 15）和健康对照组（N = 18）进行了一项手部偏侧性任务，其中她们自己的手（自我刺激）和其他人的手（他人刺激）以不同方向显示。参与者必须在脑海中旋转自己的手以做出偏侧性判断。通过混合方差分析分析反应时间和准确性，评估基于运动的身体自我识别中的组间差异，即隐式处理自我刺激与他人刺激时是否存在总体优势。
与对照组相反，饮食失调患者在脑海中旋转自我刺激时没有表现出时间优势（F(1, 31) = 5.6，p = 0.02；饮食失调 - 他人 = 1092 ± 256毫秒，饮食失调 - 自我 = 1097 ± 254毫秒；健康对照组 - 他人 = 1239 ± 233毫秒，健康对照组 - 自我 = 1192 ± 232毫秒）。
本研究提供了初步迹象，表明高水平运动功能可能作为饮食失调中身体图式障碍的一部分而受到损害。需要进一步的大规模调查来测试饮食失调中身体图式障碍背景下的运动系统异常。
