Action Congruency Influences Crowding When Discriminating Biological Motion Direction
Action Congruency Influences Crowding When Discriminating Biological Motion Direction
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DOI：
10.1177/0301006616651952
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发表时间：
2016-09-01
期刊：
影响因子：
1.7
通讯作者：
Watanabe, Katsumi
中科院分区：
文献类型：
--
作者：
Ikeda, Hanako;Watanabe, Katsumi
当目标附近存在少数刺激时（拥挤），识别和区分外周刺激通常很困难。我们以前的研究表明，拥挤发生步行方向的生物运动刺激的歧视。在本研究中，我们试图研究是否目标和侧翼之间的动作一致性会影响生物运动刺激的拥挤效应。每个生物运动刺激包括一个动作（例如，走路、扔废纸等）并围绕垂直轴在五个方向之一上旋转。在实验1中，观察者区分目标刺激动作的方向，这是由两个侧翼包围在周边视野。当侧翼个体与目标个体的动作相同且方向不同时，拥挤效应更强。动作类型的一致性增强了方向辨别任务中的拥挤效应。在实验2中，观察者区分目标刺激的动作类型。动作辨别任务的拥挤效应不受动作方向一致性的调节。因此，相同的行动诱导了更大的拥挤效应的行动方向的歧视，但一致的方向并没有影响拥挤的行动类型的歧视。这些结果表明，参与生物运动的方向辨别过程部分不同于动作辨别过程。
Identification and discrimination of peripheral stimuli are often difficult when a few stimuli adjacent to the target are present (crowding). Our previous study showed that crowding occurs for walking direction discrimination of a biological motion stimulus. In the present study, we attempted to examine whether action congruency between the target and flankers would influence the crowding effect on biological motion stimuli. Each biological motion stimulus comprised one action (e.g., walking, throwing wastepaper, etc.) and was rotated in one of five directions around the vertical axis. In Experiment 1, observers discriminated between the directions of the target stimulus actions, which were surrounded by two flankers in the peripheral visual field. The crowding effect was stronger when the flankers performed the same action as the target and the directions differed. The congruency of action type enhanced the crowding effect in the direction-discrimination task. In Experiment 2, observers discriminated between action types of target stimuli. The crowding effect for the action-discrimination task was not modulated by the congruency of action direction. Thus, identical actions induced a larger crowding effect for action-direction discrimination, but congruent directions did not influence crowding for action-type discrimination. These results suggest that the processes involved in direction discrimination of biological motion are partially distinct from action discrimination processes.