Department of Psychological and Brain Sciences, University of Delaware.
J Exp Psychol Hum Percept Perform. 2021 Mar;47(3):344-356. doi: 10.1037/xhp0000893. Epub 2021 Jan 25.
The location of touch can be represented in a somatotopic reference frame and, combined with proprioceptive information, in an external reference frame. There is evidence that body position influences where individuals feel touch on the skin surface, indicating that proprioceptive information affects tactile localization in a somatotopic reference frame. In conditions with visual and proprioceptive mismatch of body position, where do individuals feel touch on the body? We used the mirror box illusion to address this question. Participants placed 1 hand on each side of a mirror aligned with the body midline, such that the hand reflection in the mirror looked like the hand hidden behind the mirror. The illusion creates a spatial mismatch between the actual hidden hand position and where the participant perceives their hand to be (the mirror image location). Across three experiments, localization judgments on the hidden hand were consistently and systematically biased toward the actual hand position relative to the viewed hand position. These findings provide evidence that proprioceptive estimates of limb position influence tactile localization and are discussed in relation to two models of tactile localization. (PsycInfo Database Record (c) 2021 APA, all rights reserved).
触觉的位置可以用体构图参考系来表示，并且结合本体感觉信息，还可以用外部参考系来表示。有证据表明，身体姿势会影响个体在皮肤表面感觉到触摸的位置，这表明本体感觉信息会影响体构图参考系中的触觉定位。在视觉和本体感觉与身体姿势不匹配的情况下，个体在身体的哪个部位感觉到触摸？我们使用镜像箱错觉来解决这个问题。参与者将一只手放在镜子的每一侧，与身体中线对齐，这样镜子里的手的反射就像是隐藏在镜子后面的手。这种错觉在手的实际隐藏位置和参与者感知到手的位置（镜像位置）之间造成了空间上的不匹配。在三个实验中，隐藏手的定位判断都一致且系统地偏向于实际手的位置，相对于看到的手的位置。这些发现提供了证据，表明肢体位置的本体感觉估计会影响触觉定位，并结合两种触觉定位模型进行了讨论。（PsycInfo 数据库记录（c）2021 APA，保留所有权利）。
