Visual-motor adaptation. Quantitative demonstration in patients with posterior fossa involvement.
Visual-motor adaptation. Quantitative demonstration in patients with posterior fossa involvement.
复制标题
视觉运动适应。
作者：
G. Gauthier;J. M. Hofferer;W. Hoyt;L. Stark
在正常受试者和非急性后颅窝病变患者中研究了放大眼镜片的短期视觉运动适应。当正常的受试者通过放大镜观察时，在不看手的情况下将开环指向目标，他们最初低估了距离（放大效应）。经过20分钟的闭环训练或适应暴露期，在此期间，他们观察了他们的手的表现，一个修改后的视觉运动方案演变，补偿了大约一半的镜头引起的指向错误（适应效应）。自适应后取出镜片导致开环、过冲指向误差（自适应后效）。4例小脑症状缓解的患者显示正常的视觉运动适应性表现，证据表明有能力重新校准增益。1例持续性小脑共济失调患者在闭环视觉运动训练期间无法重新校准增益。他的短暂性腭肌阵挛的历史暗示了小脑橄榄系统在视觉运动增益校准中的作用。
Short-term visual-motor adaptation to magnifying spectacle lenses was studied in normal subjects and in patients with nonacute posterior fossa lesions. When normal subjects, looking through magnifying lenses, pointed open loop to targets without viewing their hands, they initially underestimated the distance (magnification effect). After a 20-minute close-loop training or adaptation exposure period during which they viewed the performance of their hands, a modified visual-motor scheme evolved, compensating for about half of the lens-induced pointing error (adaptation effect). Removal of the lenses after adaptation caused open-loop, overshooting pointing errors (adaptation after-effect). Four patients with remission of cerebellar signs showed normal visual-motor adaptive performance, evidence of ability to recalibrate gain. One patient with persisting cerebellar ataxia was unable to recalibrate gain during close-loop visual-motor training. His history of transient palatal myoclonus implicates a role for the cerebellar-olivary system in calibration of visual-motor gain.