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首页> 外文期刊>NeuroImage >Perception of object motion in three-dimensional space induced by cast shadows.
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Perception of object motion in three-dimensional space induced by cast shadows.

机译：投射阴影在三维空间中对物体运动的感知。

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摘要

Cast shadows can be salient depth cues in three-dimensional (3D) vision. Using a motion illusion in which a ball is perceived to roll in depth on the bottom or to flow in the front plane depending on the slope of the trajectory of its cast shadow, we investigated cortical mechanisms underlying 3D vision based on cast shadows using fMRI techniques. When modified versions of the original illusion, in which the slope of the shadow trajectory (shadow slope) was changed in 5 steps from the same one as the ball trajectory to the horizontal, were presented to participants, their perceived ball trajectory shifted gradually from rolling on the bottom to floating in the front plane as the change of the shadow slope. This observation suggests that the perception of the ball trajectory in this illusion is strongly affected by the motion of the cast shadow. In the fMRI study, cortical activity during observation of the movies of the illusion was investigated. We found that the bilateral posterior-occipital sulcus (POS) and right ventral precuneus showed activation related to the perception of the ball trajectory induced by the cast shadows in the illusion. Of these areas, it was suggested that the right POS may be involved in the inferring of the ball trajectory by the given spatial relation between the ball and the shadow. Our present results suggest that the posterior portion of the medial parietal cortex may be involved in 3D vision by cast shadows.
机译：投射阴影可能是三维（3D）视觉中明显的深度提示。使用运动幻觉，根据球的投射阴影轨迹的斜率，感知球在底部深处滚动或在前平面中流动，我们使用fMRI技术研究了基于投射阴影的3D视觉的皮层机制。当向参与者呈现原始幻觉的修改版本，其中阴影轨迹的斜率（阴影斜率）从与球轨迹相同的水平向水平方向变化了5步时，他们的感知球轨迹从滚动逐渐转移随着阴影斜率的变化，在底部浮动到正面。该观察结果表明，在这种幻觉中对球轨迹的感知受投射阴影的运动强烈影响。在fMRI研究中，研究了在观察幻觉电影期间的皮质活动。我们发现，双侧后枕沟（POS）和右腹前突神经显示出与幻觉中投射阴影诱导的球​​轨迹感知有关的激活。在这些区域中，建议通过在球与阴影之间的给定空间关系，正确的POS可能参与到球的轨迹推断中。我们目前的结果表明，内侧顶叶皮质的后部可能通过投射阴影参与了3D视觉。

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