Association Between Body Tilt and Egocentric Estimates Near Upright
Association Between Body Tilt and Egocentric Estimates Near Upright
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DOI：
10.1163/22134808-bja10097
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发表时间：
2023-04-01
影响因子：
1.6
通讯作者：
Tanaka，Satoshi
中科院分区：
文献类型：
--
作者：
Tani，Keisuke;Uehara，Shintaro;Tanaka，Satoshi
地心（一个物体或身体相对于“重力”的方向）和自我中心的估计（物体相对于“身体”的方向）的潜在机制已经被研究;然而，关于这些估计之间的关联，特别是当身体几乎直立时，知之甚少。为了解决这个问题，我们进行了两个心理物理实验。在实验1中，参与者估计的方向的视线（主观视觉垂直; SVV）和自己的身体相对于重力（主观身体倾斜; SBT）和方向的视线相对于身体纵轴（主观视觉身体轴; SVBA）在小范围的全身滚动倾斜。我们评估了这些任务中的每一个作为实际身体倾斜角度的协变量的性能之间的相关性。我们的研究结果表明，一个显着的相关性的性能（估计误差）的SVBA任务与性能的SBT任务，但不执行SVV任务在组水平调整后的实际身体倾斜角度，这表明之间的联系估计SVBA和SBT任务。为了证实这种关系，在实验2中，我们进一步评估是否操纵主观方向的身体轴提供视觉反馈的SVBA任务随后影响SBT性能。我们发现，在SVBA任务中的反馈显着转移SBT的角度，即使实际的身体角度是相同的。观察到的SVBA和SBT性能之间的关联支持至少部分共享的机制，身体倾斜和自我中心的估计时，身体几乎直立。
The mechanisms underlying geocentric (orientations of an object or the body relative to ‘gravity’) and egocentric estimates (object orientation relative to the ‘body’) have each been examined; however, little is known regarding the association between these estimates, especially when the body is nearly upright. To address this, we conducted two psychophysical experiments. In Experiment 1, participants estimated the direction of a visual line (subjective visual vertical; SVV) and their own body relative to gravity (subjective body tilt; SBT) and the direction of a visual line relative to the body longitudinal axis (subjective visual body axis; SVBA) during a small-range whole-body roll tilt. We evaluated the correlations between performance on each of these tasks as covariates of actual body tilt angles. Our results showed a significant correlation of performance (estimation errors) on the SVBA task with performance on the SBT task but not performance on the SVV task at the group level after adjusting for the actual body tilt angles, suggesting a link between the estimates for SVBA and SBT tasks. To confirm this relationship, in Experiment 2, we further assessed whether manipulating the subjective direction of the body axis by providing visual feedback in the SVBA task subsequently affected SBT performance. We found that feedback in the SVBA task significantly shifted the SBT angles even when the actual body angles were identical. The observed association between SVBA and SBT performance supports at least a partially shared mechanism underlying body tilt and egocentric estimates when the body is nearly upright.