Theusner Stefanie, de Lussanet Marc H E, Lappe Markus
Institute of Psychology and Otto Creutzfeldt Center for Cognitive and Behavioral Neuroscience, University of Muenster, Fliednerstrasse 21, Münster, Germany.
Atten Percept Psychophys. 2011 Aug;73(6):1843-55. doi: 10.3758/s13414-011-0133-7.
Recent models have proposed a two-stage process of biological motion recognition. First, template or snapshot neurons estimate the body form. Then, motion is estimated from body form change. This predicts separate aftereffects for body form and body motion. We tested this prediction. Observers viewing leftward- or rightward-facing point-light walkers that walked forward or backward subsequently experienced oppositely directed aftereffects in stimuli ambiguous in the facing or the walking direction. These aftereffects did not originate from adaptation to the motion of the individual light points, because they occurred for limited-lifetime stimuli that restrict local motion. They also occurred when the adaptor displayed a random sequence of body postures that did not induce the walking motion percept. We thus conclude that biological motion gives rise to separate form and motion aftereffects and that body form representations are involved in biological motion perception.
最近的模型提出了生物运动识别的两阶段过程。首先,模板或快照神经元估计身体形态。然后,根据身体形态变化估计运动。这预测了身体形态和身体运动的不同后效应。我们对这一预测进行了测试。观察者观看向前或向后行走的向左或向右的点光步行者后,在面对方向或行走方向模棱两可的刺激中随后经历了相反方向的后效应。这些后效应并非源于对单个光点运动的适应,因为它们出现在限制局部运动的有限持续时间刺激中。当适应刺激显示出不诱导行走运动感知的身体姿势随机序列时,后效应也会出现。因此,我们得出结论,生物运动产生了不同的形态和运动后效应,并且身体形态表征参与了生物运动感知。