Chazelle Thomas, Guerraz Michel, Palluel-Germain Richard
Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LPNC, 38000 Grenoble, France.
R Soc Open Sci. 2023 Aug 16;10(8):221589. doi: 10.1098/rsos.221589. eCollection 2023 Aug.
Prolonged visual exposure to large bodies produces a thinning aftereffect on subsequently seen bodies, and vice versa. This visual adaptation effect could contribute to the link between media exposure and body shape misperception. Indeed, people exposed to thin bodies in the media, who experience fattening aftereffects, may internalize the distorted image of their body they see in the mirror. This preregistered study tested this internalization hypothesis by exposing 196 young women to an obese adaptor before showing them their reflection in the mirror, or to a control condition. Then, we used a psychophysical task to measure the effects of this procedure on perceptual judgements about their own body size, relative to another body and to the control mirror exposure condition. We found moderate evidence against the hypothesized self-specific effects of mirror exposure on perceptual judgements. Our work strengthens the idea that body size adaptation affects the perception of test stimuli rather than the participants' own body image. We discuss recent studies which may provide an alternative framework to study media-related distortions of perceptual body image.
长时间视觉接触大体型会对随后看到的体型产生变瘦的后效应，反之亦然。这种视觉适应效应可能有助于解释媒体接触与体型误判之间的联系。确实，接触媒体中瘦体型的人会经历变胖的后效应，他们可能会将在镜子中看到的自己身体的扭曲形象内化。这项预先注册的研究通过让196名年轻女性在照镜子之前先接触一个肥胖的适配刺激物，或者处于对照条件，来检验这种内化假设。然后，我们使用一项心理物理学任务来测量该程序对她们关于自己身体大小的感知判断的影响，相对于另一个身体以及对照的镜子暴露条件。我们发现有适度的证据反对镜子暴露对感知判断具有假设中的自我特异性效应。我们的研究强化了这样一种观点，即体型适应会影响对测试刺激的感知，而不是参与者自身的身体形象。我们讨论了近期的研究，这些研究可能为研究与媒体相关的感知身体形象扭曲提供一个替代框架。
