Dynamics of visual reversals from ambiguous spinning biological-motion and rigid structure-from-motion.

IF 2.4 4区 心理学 Q2 PSYCHOLOGY, EXPERIMENTAL
I-Perception Pub Date : 2025-05-21 eCollection Date: 2025-05-01 DOI:10.1177/20416695251342410
Leo Poom
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Abstract

Three-dimensional rigid structure-from-motion (SFM) and structure from nonrigid biological point-light motion stimuli are perceptually ambiguous. This study investigated the dynamics of perceived reversals in two cases: a spinning point-light walker (PLW) and a spinning rigid human figure in a walking pose (SFM). It specifically focused on two key questions: Could the facing-the-viewer bias (FTV) account for the reversals for spinning PLW? To what extent do motion cues from limb motions or configural cues from the human shape contribute to the perceived reversals? In Experiment 1, participants reported reversals with more than twice the frequency while viewing the upright and inverted PLW than for the rigid structures, but an FTV bias was observed only for the upright walker. The perception of an ambulating living human shape of typically encountered walkers in an upright position thus plays a crucial role in obtaining an FTV bias for these spinning stimuli. In Experiment 2, the human figures walked or rigidly moved along a circular path while facing the motion direction, spinning at the same rate as in Experiment 1. A strong initial FTV bias was then observed, but the reversal rate was substantially reduced compared to reversals when spinning on the same spot. These findings highlight theoretically interesting distinct temporal dynamics of reversals and biases between biological motion and rigid SFM. It is argued that the differences in reversals between conditions have a common cause in the form of past experiences that differ between conditions.

模糊旋转生物运动和刚性运动结构的视觉逆转动力学。
三维刚性运动结构(SFM)和非刚性生物点光运动刺激的结构在感知上是模糊的。本研究调查了两种情况下感知反转的动力学:旋转点光步行者(PLW)和旋转刚性人体在步行姿势(SFM)。它特别关注了两个关键问题:面对观众的偏见(FTV)能否解释旋转PLW的逆转?肢体运动的动作线索或人体形状的构造线索在多大程度上促成了感知到的逆转?在实验1中,参与者在观看直立和倒立的PLW时报告的反转频率是观看刚性结构时的两倍以上,但仅在直立行走者中观察到FTV偏差。因此,对于直立行走的人的感知在获得这些旋转刺激的FTV偏差中起着至关重要的作用。在实验2中,人物面朝运动方向沿圆周路径行走或刚性移动,旋转速率与实验1相同。然后观察到强烈的初始FTV偏差,但与在同一地点旋转时的反转相比,反转率大大降低。这些发现在理论上突出了生物运动和刚性SFM之间反转和偏差的有趣的独特时间动态。有人认为,不同条件之间的逆转差异有一个共同的原因,即不同条件之间的过去经验不同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
I-Perception
I-Perception PSYCHOLOGY, EXPERIMENTAL-
CiteScore
4.30
自引率
5.30%
发文量
39
审稿时长
12 weeks
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