ISSN 1671-3710
CN 11-4766/R

心理科学进展 ›› 2022, Vol. 30 ›› Issue (11): 2529-2539.doi: 10.3724/SP.J.1042.2022.02529

• 研究前沿 • 上一篇    下一篇


刘爽爽1,2, 肖斌3, 王葵1,2(), 陈楚侨1,2   

  1. 1中国科学院心理研究所心理健康重点实验室, 神经心理学与应用认知神经科学实验室, 北京 100101
    2中国科学院大学心理系, 北京 100049
    3中国科学院大学心理健康教育中心, 北京 100049
  • 收稿日期:2021-12-15 出版日期:2022-11-15 发布日期:2022-11-09
  • 通讯作者: 王葵

Body size perception: Accuracy and cognitive mechanisms

LIU Shuang-shuang1,2, XIAO Bing3, WANG Kui1,2(), Raymond C.K. CHAN1,2   

  1. 1Neuropsychology and Applied Cognitive Neuroscience Laboratory, CAS Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing 100101, China
    2Department of Psychology, University of Chinese Academy of Sciences, Beijing 100049, China
    3Mental Health Education Center, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2021-12-15 Online:2022-11-15 Published:2022-11-09
  • Contact: WANG Kui


体型知觉的准确性既和一般人群的心理健康水平有关, 又对进食障碍的理解、预防和治疗具有重要意义。首先, 进食障碍患者可能高估自己的身体, 其体型知觉准确度可能受其BMI和症状的影响, 并与患者预后相关。其次, 通过和对他人体型估计的结果进行对比发现, 对自己的体型的高估可能受到对自己身体态度因素的影响。第三, 一般人群对自己的体型估计的结果往往不一致, 这可能是体型知觉的不同量化方式所致。最后, 体型知觉准确性的相关认知机制主要有收缩偏差、视觉适应和序列依赖效应。

关键词: 体型知觉, 进食障碍, 机制, 偏差, BMI


Body size perception refers to how an individual perceives the size, weight and proportions of his/her body. Distorted body size perception can be a mental health problems, and is associated with psychiatric disorders such as eating disorders, body dysmorphic disorder, depression, and certain psychotic disorders. This is an often-ignored research area, with largely inconsistent evidence.

The extant literature concerning body size perception in patients with eating disorders generally supports four notions. First, anorexia nervosa (AN) patients and bulimia nervosa (BN) patients both overestimate their body size, but the magnitude of such distorted perception varies with different methods estimating one’s body size. Two commonly-used methods for body size estimation are the ‘depictive method’ and the ‘metric method’. The latter method usually generated a higher degree of overestimation in body size than the former method in patients with eating disorders. Second, the distorted body size perception in AN patients may be confounded by their extremely low body mass index (BMI). Yet, this previous finding is inconsistent due to the ecological validity of the ‘depictive’ and ‘metric’ methods. Third, AN and BN patients have different estimates of body size perception for "self" versus "others", and such discrepancy may be related to attitudes towards themselves. However, attitudinal factors and its effect on body size perception are seldom studied and thus remain unclear. Lastly, distorted body size perception in patients with eating disorder is correlated with symptom severity and could indicate prognosis of the illness. Body size perception is also one of the intervention targets for treating eating disorders.

The literature remains inconclusive regarding whether healthy people have accurate body size perception, because previous findings vary with different designs in measuring body size perception, sample characteristics (demographics and geographical-cultural aspects). Yet in general, healthy people tend to perceive others’ body size consistently, with overestimation for others with low BMIs, and underestimation for others with high BMIs.

Three cognitive mechanisms underlying distorted body size perception have been proposed, namely contraction bias, adaptive after-effect and serial dependence. These putative mechanisms operate in health people and patients with eating disorders. In view of the above-mentioned review of the literature, we recommended three useful approaches for research in body size perception. First, it is necessary to distinguish two different methods for estimating body size perception, namely the ‘recognition technique’ (which involves the use of a visual analogue as reference in measurements) and the ‘recall technique” (which does not involve any visual analogue). It is likely that the two methods will yield different estimates from subjects, and may partly account for the inconsistent finding in the literature. Second, the problems of unclear definition of “overestimation” in previous studies should be addressed, by developing operational criteria and a standardized definition across different paradigms. Third, male subjects should be included in future study, because this gender has been under-represented in previous research. Lastly, in view of the growing incidence of eating disorders, body size perception is a worthy topic for research in China.

Key words: body size perception, eating disorders, mechanism, inaccuracy, BMI