Mennemeier M, Chatterjee A, Heilman K M
Department of Rehabilitation Medicine, University of Alabama, Birmingham.
Brain. 1994 Oct;117 ( Pt 5):1013-21. doi: 10.1093/brain/117.5.1013.
Extrapersonal space can be defined by coordinate systems, or frames of reference, that are centred on the body (viewer) or on the environment. Although these frames are identical in the upright position, when the body is placed in positions orthogonal to gravity, the frames may be dissociable. We compared the influences of environmental and body-centred frames on line bisection in two patients with neglect who, when upright, neglected opposite dimensions of space. Through certain combinations of line placement and body orientation, the body and environmental frames were brought into opposition, and each frame predicted line bisection errors in an opposite direction. When the patients were positioned so that predictions of the two frames contrasted, both bisected lines as predicted by the environmental rather than the body-centred frame.
个人空间之外的空间可以通过以身体（观察者）或环境为中心的坐标系或参照系来定义。尽管这些参照系在直立姿势时是相同的，但当身体处于与重力垂直的位置时，这些参照系可能会分离。我们比较了环境参照系和以身体为中心的参照系对两名患有忽视症患者的线段二等分的影响，这两名患者在直立时忽视了空间的相反维度。通过线段放置和身体方位的特定组合，身体参照系和环境参照系产生了对立，并且每个参照系都在相反方向上预测了线段二等分误差。当患者处于使两个参照系的预测形成对比的位置时，他们都按照环境参照系而非以身体为中心的参照系的预测来二等分线段。
