Nawrot M, Rizzo M
Department of Psychology, North Dakota State University, Fargo 58105, USA.
Vision Res. 1998 Jul;38(14):2219-24. doi: 10.1016/s0042-6989(97)00297-6.
A selective motion perception deficit is seen in patients with acute midline cerebellar lesions. Patients with more lateralized acute cerebellar damage do not demonstrate such a deficit (Nawrot M, Rizzo M. Vis Res 1995;35:723-731). However, as these patients were tested only between 10 and 14 days post-ictus, the stability of this perceptual deficit into the chronic phase remained undetermined. The current study extends the previous findings by showing that the motion perception deficit caused by mid-line cerebellar lesions remains permanent at least 2 years into the chronic phase. The extent and longevity of this deficit resembles that of the well known motion-blind patient LM who has a large cerebellar lesion in addition to her extensive cortical damage. Again, we propose that the mid-line cerebellar damage may produce a severe motion perception deficit by disruption the visual-motor integration mechanisms involved in perceptual stabilization, even though cortical motion processing mechanisms are unaffected.
急性中线小脑病变患者存在选择性运动感知缺陷。急性小脑损伤更偏向一侧的患者则未表现出这种缺陷（纳罗特M，里佐M。《视觉研究》1995年；35:723 - 731）。然而，由于这些患者仅在发病后10至14天接受测试，这种感知缺陷在慢性期的稳定性仍未确定。当前研究扩展了先前的发现，表明中线小脑病变导致的运动感知缺陷在慢性期至少持续2年仍然存在。这种缺陷的程度和持续时间类似于著名的运动盲患者LM，她除了广泛的皮质损伤外，还有一个大的小脑病变。同样，我们提出中线小脑损伤可能通过破坏参与感知稳定的视觉 - 运动整合机制而产生严重的运动感知缺陷，即使皮质运动处理机制未受影响。
