Bradshaw J L, Nettleton N C, Nathan G, Wilson L
Neuropsychologia. 1985;23(3):421-5. doi: 10.1016/0028-3932(85)90029-6.
In Experiment I normal subjects performed the classical clinical line-bisection task, and demonstrated a left-side underestimation. In Experiment II subjects maintained fixation upon a central position and adjusted a rod passing through this fixation point so that both extremities were judged equal. The left-side underestimation was very much greater under these conditions, but was considerably reduced when retinal and gravitational coordinates were dissociated by making the subjects lie horizontally on one or other side. Subjects then demonstrated greater left-side and top-half underestimation when lying on the left than on the right side. Gravitational coordinates and the apparent locus of events in extrapersonal space are determinants of perceptual asymmetries at least as important as anatomical connectivities.
在实验一中，正常受试者执行经典的临床线段二等分任务，并表现出左侧低估现象。在实验二中，受试者固定注视中心位置，并调整一根穿过该注视点的杆，以使两端被判断为相等。在这些条件下，左侧低估现象要严重得多，但当通过让受试者向一侧水平躺卧来使视网膜坐标和重力坐标分离时，这种低估现象会显著减少。然后，受试者向左侧躺卧时比向右侧躺卧时表现出更大的左侧和上半部分低估现象。重力坐标和个人空间之外事件的表观轨迹至少与解剖连接性一样，是感知不对称性的决定因素。
