Saj A, Honoré J, Richard C, Bernati T, Rousseaux M
URECA, University of Lille 3, BP 149, 59653 Villeneuve d'Ascq Cedex, France.
J Neurol Neurosurg Psychiatry. 2008 Sep;79(9):991-6. doi: 10.1136/jnnp.2007.124412. Epub 2008 Jan 25.
The subjective straight ahead (SSA), a measure of the representation of body orientation, has been shown to be shifted to the lesion side in neglect patients, and to be influenced by stimulation of sensory systems involved in postural control.
This study investigates the influence of changing body orientation in the sagittal plane on the SSA in 21 patients with a right hemispheric lesion, of whom 12 had neglect, in comparison with six healthy control subjects. In order to quantify both horizontal components of SSA error (ie, yaw rotation and lateral shift), the study used a method requiring the alignment of a luminous rod with SSA.
Neglect patients showed a significant rightward shift in the sitting position, which was greatly reduced in the supine position. No shift occurred in patients without neglect or in controls. Yaw rotation did not reach significance in any group.
The data showed that the body centred frame of reference, mostly translated in neglect, is strongly improved in the supine position. Changing body orientation seems to be a convenient tool to correct the representation of body midline.
主观正前方（SSA）是衡量身体方位表征的指标，研究表明忽视症患者的SSA会向病灶侧偏移，且受参与姿势控制的感觉系统刺激的影响。
本研究调查了21例右侧半球病变患者（其中12例有忽视症状）与6名健康对照者相比，矢状面身体方位变化对SSA的影响。为了量化SSA误差的两个水平分量（即偏航旋转和横向移位），该研究采用了一种要求发光棒与SSA对齐的方法。
忽视症患者在坐位时出现显著的向右移位，而在仰卧位时这种移位大大减少。无忽视症状的患者或对照组未出现移位。偏航旋转在任何组中均未达到显著水平。
数据表明，以身体为中心的参照系（在忽视症中大多发生偏移）在仰卧位时得到显著改善。改变身体方位似乎是纠正身体中线表征的便捷工具。
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