Van Mier Hanneke I
Faculty of Psychology and Neuroscience, Department of Cognitive Neuroscience, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands.
Acta Psychol (Amst). 2013 Oct;144(2):352-60. doi: 10.1016/j.actpsy.2013.07.003. Epub 2013 Aug 10.
Research has revealed that haptic perception of parallelity deviates from physical reality. Large and systematic deviations have been found in haptic parallelity matching most likely due to the influence of the hand-centered egocentric reference frame. Providing information that increases the influence of allocentric processing has been shown to improve performance on haptic matching. In this study allocentric processing was stimulated by providing informative vision in haptic matching tasks that were performed using hand- and arm-centered reference frames. Twenty blindfolded participants (ten men, ten women) explored the orientation of a reference bar with the non-dominant hand and subsequently matched (task HP) or mirrored (task HM) its orientation on a test bar with the dominant hand. Visual information was provided by means of informative vision with participants having full view of the test bar, while the reference bar was blocked from their view (task VHP). To decrease the egocentric bias of the hands, participants also performed a visual haptic parallelity drawing task (task VHPD) using an arm-centered reference frame, by drawing the orientation of the reference bar. In all tasks, the distance between and orientation of the bars were manipulated. A significant effect of task was found; performance improved from task HP, to VHP to VHPD, and HM. Significant effects of distance were found in the first three tasks, whereas orientation and gender effects were only significant in tasks HP and VHP. The results showed that stimulating allocentric processing by means of informative vision and reducing the egocentric bias by using an arm-centered reference frame led to most accurate performance on parallelity matching.
研究表明，对平行性的触觉感知与物理现实存在偏差。在触觉平行性匹配中发现了较大且系统的偏差，这很可能是由于以手部为中心的自我中心参考框架的影响。已证明提供能增加以客体为中心处理影响的信息可提高触觉匹配的表现。在本研究中，通过在使用以手部和手臂为中心的参考框架执行的触觉匹配任务中提供信息性视觉来刺激以客体为中心的处理。20名蒙眼参与者（10名男性，10名女性）用非优势手探索参考棒的方向，随后用优势手在测试棒上匹配（任务HP）或镜像（任务HM）其方向。视觉信息通过信息性视觉提供，参与者能完全看到测试棒，而参考棒则被遮挡使其看不到（任务VHP）。为减少手部的自我中心偏差，参与者还使用以手臂为中心的参考框架执行了一项视觉触觉平行性绘制任务（任务VHPD），即绘制参考棒的方向。在所有任务中，棒之间的距离和方向均受到操控。发现任务有显著影响；表现从任务HP到VHP再到VHPD以及HM逐步提高。在前三项任务中发现了距离的显著影响，而方向和性别的影响仅在任务HP和VHP中显著。结果表明，通过信息性视觉刺激以客体为中心的处理并使用以手臂为中心的参考框架减少自我中心偏差可在平行性匹配中带来最准确的表现。
