Satomi K, Kinoshita Y, Hirakawa S
Second Department of Internal Medicine, Gifu University School of Medicine.
Cortex. 1991 Jun;27(2):327-31. doi: 10.1016/s0010-9452(13)80138-4.
If defective cross-localization of fingertips (CLF) in callosal patients is due to a deficit in the interhemispheric transfer of somesthetic information, when the patient's eyes are open, CLF should be affected when the stimulated hand is excluded from vision, not when the responding hand is excluded from vision. In order to investigate this hypothesis, a patient with a callosal lesion was subjected to CLF with eyes closed and open. With eyes closed, the CLF score in the left-to-right direction was significantly lower than that in the right-to-left direction. With eyes open, the CLF performance in the right-to-left direction was impaired when it was the responding hand to be excluded from vision, not when it was the stimulated hand to be excluded from vision. It would, therefore, appear that the patient's CLF disturbance was not due to a somesthetic transfer deficit, but to left unilateral apraxia for the right-to-left direction errors and to left tactile finger anomia for the left-to-right direction errors.
如果胼胝体病变患者指尖交叉定位（CLF）缺陷是由于躯体感觉信息半球间传递不足所致，那么当患者眼睛睁开时，若受刺激手被遮挡而无法看见，CLF应会受到影响，而不是当反应手被遮挡而无法看见时。为了验证这一假设，对一名患有胼胝体病变的患者在闭眼和睁眼状态下进行CLF测试。闭眼时，从左到右方向的CLF评分显著低于从右到左方向。睁眼时，当反应手被遮挡而无法看见时，从右到左方向的CLF表现受损，而不是当受刺激手被遮挡而无法看见时。因此，看起来该患者的CLF障碍并非由于躯体感觉传递缺陷，而是由于从右到左方向错误时存在左侧单侧失用症，以及从左到右方向错误时存在左侧触觉手指命名不能。
