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Inverting the Facing-the-Viewer Bias for Biological Motion Stimuli

机译：反转面向生物运动刺激的面向观看者的偏见

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Depth-ambiguous point-light walkers are most frequently seen as facing-the-viewer (FTV). It has been argued that the FTV bias depends on recognising the stimulus as a person. Accordingly, reducing the social relevance of biological motion by presenting stimuli upside down has been shown to reduce FTV bias. Here, we replicated the experiment that reported this finding and added stick figure walkers to the task in order to assess the effect of explicit shape information on facing bias for inverted figures. We measured the FTV bias for upright and inverted stick figure walkers and point-light walkers presented in different azimuth orientations. Inversion of the stimuli did not reduce facing direction judgements to chance levels. In fact, we observed a significant facing away bias in the inverted stimulus conditions. In addition, we found no difference in the pattern of data between stick figure and point-light walkers. Although the results are broadly consistent with previous findings, we do not conclude that inverting biological motion simply negates the FTV bias; rather, inversion causes stimuli to be seen facing away from the viewer more often than not. The results support the interpretation that primarily low-level visual processes are responsible for the biases produced by both upright and inverted stimuli.
机译：深度模糊的点光步行者最常被视为面对观众（FTV）。有人认为，FTV的偏向取决于将刺激视为一个人。因此，已经显示通过倒置呈现刺激来降低生物运动的社会相关性可减少FTV偏向。在这里，我们复制了报告此发现的实验，并在任务中添加了棒形图助步器，以评估显式形状信息对倒立形图面偏向的影响。我们测量了以不同方位角方向显示的立式和倒立式拐杖助步器和点光源助步器的FTV偏差。刺激的倒置并没有将面对方向的判断降低到机会水平。实际上，我们在反向刺激条件下观察到了显着的消除偏见。此外，我们发现简笔画和点光源步行者之间的数据模式没有差异。尽管结果与以前的发现大体上一致，但我们不能得出结论，颠倒生物运动会完全抵消FTV的偏见。相反，倒置会使刺激更多地背离观看者。结果支持以下解释：主要是低水平的视觉过程是由直立和反向刺激产生的偏见所致。

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