Constancy of target velocity as a critical factor in the emergence of auditory and visual representational momentum
Constancy of target velocity as a critical factor in the emergence of auditory and visual representational momentum
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DOI：
10.1007/s00221-008-1641-0
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发表时间：
2009-03-01
影响因子：
2
通讯作者：
Lewald, Joerg
中科院分区：
文献类型：
--
作者：
Getzmann, Stephan;Lewald, Joerg
表征动量是指移动听觉或视觉目标的判断最终位置沿运动路径向前移动太远的倾向。这里通过比较最终位置的表观位移与恒定或不规则变化的目标速度来研究这种现象。沿着水平面移动的听觉或视觉目标的最终位置通过手动指向来指示。在这两种模式中，我们发现与恒定速度相比，不同速度下的位移幅度要小得多。无论参与者是否用眼睛追逐视觉目标，位移都会减少。这些发现表明，表征动量的出现关键取决于目标速度的恒定性。结果与模型兼容，在该模型中，运动信号的变化可以超越通常导致表征动量向前位移的外推机制。
Representational momentum refers to the tendency to displace the judged final position of a moving auditory or visual target as being too far forward along the path of motion. This phenomenon was investigated here by comparing apparent displacements in final position with constant or with irregularly varying target velocities. Final positions of auditory or visual targets, moving along the horizontal plane, were indicated by manual pointing. In both modalities, we found a significantly smaller displacement magnitude with varying velocities compared to constant velocity. The reduction in displacement occurred irrespective of whether or not the participants pursued the visual targets with their eyes. These findings indicate that the emergence of representational momentum critically depends on the constancy of target velocity. The results are compatible with a model in which changes in the motion signal can override the extrapolation mechanism that usually causes the forward displacement of representational momentum.