Bidet-Ildei Christel, Orliaguet Jean-Pierre, Sokolov Alexander N, Pavlova Marina
Developmental Cognitive and Social Neuroscience Unit, Department of Paedriatric Neurology and Child Development, Children's Hospital, University of Tübingen, Germany.
Perception. 2006;35(8):1137-47. doi: 10.1068/p5482.
We tested the ability of the mature visual system for discrimination between types of elliptic biological motion on the basis of event kinematics. Healthy adult volunteers were presented with point-light displays depicting elliptic motion when only a single dot, a moving point-light arm, or a whole point-light human figure was visible. The displays were created in accordance with the two-thirds power kinematic law (natural motion), whereas the control displays violated this principle (unnatural motion). On each trial, participants judged whether the display represented natural or unnatural motion. The findings indicate that adults are highly sensitive to violation of the two-thirds power kinematic law. Notably, participants can easily discriminate between natural and unnatural motions without recognising the stimuli, which suggests that people implicitly use kinematic information. Most intriguing, event recognition seems to diminish the capacity to judge whether event kinematics is unnatural. We discuss possible ways for a cross-talk between perception and production of biological movement, and the brain mechanisms involved in biological motion processing.
我们基于事件运动学测试了成熟视觉系统区分椭圆生物运动类型的能力。当仅可见单个点、一个移动的点光手臂或一个完整的点光人体时，向健康成年志愿者呈现描绘椭圆运动的点光显示。这些显示是根据三分之二次幂运动学定律（自然运动）创建的，而对照显示违反了这一原则（非自然运动）。在每次试验中，参与者判断显示代表的是自然运动还是非自然运动。研究结果表明，成年人对违反三分之二次幂运动学定律高度敏感。值得注意的是，参与者无需识别刺激就能轻松区分自然运动和非自然运动，这表明人们在隐含地使用运动学信息。最有趣的是，事件识别似乎会降低判断事件运动学是否不自然的能力。我们讨论了生物运动感知与产生之间可能的相互作用方式，以及生物运动处理中涉及的大脑机制。
