Department of Psychology, The University of Tokyo, Tokyo, Japan.
Graduate School of Engineering, The University of Tokyo, Tokyo, Japan.
PLoS One. 2020 Apr 24;15(4):e0232290. doi: 10.1371/journal.pone.0232290. eCollection 2020.
Previous research suggests that the size of one's body is used as a metric to scale the external world. On the other hand, the influence of information from the external world on the perception of body size is unclear. It has been suggested that increased inter-pupillary distance (IPD) leads people to perceive the external world as smaller than it actually is. The present study investigated the effect of the IPD on body size perception, and the relationship between the perceived scale of the body and the external world when the IPD is manipulated. To this end, in a virtual environment, we manipulated the IPD as well as the size and presence of participants' hands, while participant's eye height was increased vertically. Results showed that, when participants' eye height was increased and their hands were enlarged, people with a fixed IPD perceived the size of their body to be large (like a giant) while the external world was perceived to be changed minimally. Alternatively, people with increased IPD perceived that the external world as having shrank, whereas their perception of their body size changed little. However, when a viewers' virtual hands were not shown, the IPD did not affect the individual's percept of body size, although the IPD did affect one's perception of the external world. These results suggest that, when the ratio of the size between one's body and the external world are explicit, the perceived size of one's body is affected by the IPD or perceived scale of the external world that is affected by the IPD.
先前的研究表明，人体的大小被用作一种指标来衡量外部世界的大小。另一方面，来自外部世界的信息对身体大小感知的影响尚不清楚。有人认为，瞳孔间距离（IPD）的增加会导致人们感觉外部世界比实际要小。本研究调查了 IPD 对身体大小感知的影响，以及当 IPD 被操纵时，身体感知的比例与外部世界之间的关系。为此，在虚拟环境中，我们操纵 IPD 以及参与者手的大小和存在，同时参与者的眼睛高度在垂直方向上增加。结果表明，当参与者的眼睛高度增加且手变大时，固定 IPD 的人会将自己身体的大小感知为大（如巨人），而外部世界的感知变化很小。相反，IPD 增加的人会感觉到外部世界缩小了，而他们对自己身体大小的感知变化不大。然而，当不显示观察者的虚拟手时，IPD 不会影响个体对身体大小的感知，尽管 IPD 确实会影响个体对外部世界的感知。这些结果表明，当一个人与外部世界之间的大小比例明确时，一个人对自己身体大小的感知会受到 IPD 的影响，或者受到 IPD 影响的外部世界的感知大小会受到影响。
