Hummel Dennis, Grabhorn Ralph, Mohr Harald M
Department of Neurocognitive Psychology, Institute of Psychology, Goethe University, Mertonstrasse 17, 60054 Frankfurt, Germany.
Perception. 2012;41(11):1315-22. doi: 10.1068/p7197.
Visual adaptation to certain body shapes alters visual perception of subsequently presented pictures of bodies. We investigated whether these effects can be explained by adaptation to low-level visual objects, ie narrow and wide rectangles. Participants (n = 29) adapted to manipulated photographs of their own bodies, depicting them either unrealistically thin or fat. The perceived shapes of their own bodies were subsequently assessed by an interleaved staircase paradigm. A second experiment (n = 29) used the same design to test for adaptation effects evoked by narrow and wide bars. After adapting to a thin picture of own body, participants also judged a thinner than actual body picture to be the most realistic and vice versa, resembling a typical aftereffect. Importantly, this effect could not be replicated by adaptation to narrow and wide bars, demonstrating that the body-shape aftereffect cannot be explained by adaptation to low-level properties. The results support the existence of a perceptual body-shape aftereffect, resulting from a specific adaptation to thin and fat body shapes.
对特定身体形状的视觉适应会改变对随后呈现的身体图片的视觉感知。我们研究了这些效应是否可以通过对低水平视觉对象（即窄矩形和宽矩形）的适应来解释。参与者（n = 29）适应了自己身体的经过处理的照片，照片将他们描绘得要么异常瘦要么异常胖。随后通过交错阶梯范式评估他们对自己身体形状的感知。第二个实验（n = 29）采用相同设计来测试窄条和宽条引起的适应效应。在适应了自己身体的瘦照片后，参与者也判断比实际身体照片更瘦的照片是最逼真的，反之亦然，这类似于典型的后效。重要的是，通过适应窄条和宽条无法复制这种效应，这表明身体形状后效不能通过对低水平属性的适应来解释。结果支持了感知身体形状后效的存在，这种后效是由对瘦和胖身体形状的特定适应导致的。
