Neuropsychology Unit, Department of Neurology, University Hospital, Zurich, Switzerland.
Cortex. 2012 Nov-Dec;48(10):1320-8. doi: 10.1016/j.cortex.2011.10.003. Epub 2011 Oct 22.
To explore the idea of a perceptual distortion of space in spatial neglect, neglect patients, age-matched healthy controls and right hemisphere control patients judged the vanishing point of horizontally and vertically-moving stimuli. Hemifield of presentation and movement direction of the stimulus presentation was manipulated. The results suggest that neglect patients show a stronger response bias in the direction of the moving stimuli ("representational momentum") than healthy and right hemisphere controls. Furthermore, neglect patients, but not the control groups, showed a direction-specific response whereby the presence of neglect was associated with a larger representational momentum for leftward-moving stimuli. The one left-hemisphere patient with right-sided neglect showed the opposite effect. Thus, neglect patients showed a relative overextension into their neglected side of space. While these findings are in line with the idea of an extension in the representation of contralesional space, other explanations such as deficient spatial remapping, impairments in smooth pursuit and distortions in memorized visuo-motor movements are considered.
为了探究空间忽视中空间知觉扭曲的概念，忽视患者、年龄匹配的健康对照组和右半球对照组患者判断水平和垂直运动刺激的消失点。呈现的视野和刺激呈现的运动方向被操纵。结果表明，与健康对照组和右半球对照组相比，忽视患者在运动刺激的方向上表现出更强的反应偏差（“代表性动量”）。此外，忽视患者，但不是对照组，表现出一种特定于方向的反应，即忽视的存在与左移刺激的更大代表性动量相关。一名右侧忽视的左半球患者表现出相反的效果。因此，忽视患者在空间上表现出相对延伸到他们忽视的一侧。虽然这些发现与对侧空间的代表中延伸的观点一致，但也考虑了其他解释，如空间映射不足、平滑追踪障碍和记忆中的视动运动扭曲。
