Sharpe J A, Herishanu Y O, White O B
Neurology. 1982 Jan;32(1):57-62. doi: 10.1212/wnl.32.1.57.
Abnormal saccadic intrusions consisting of frequent sporadic horizontal saccades followed, after an interval, by corrective saccades occurred in 70% of 17 patients with acute or chronic focal cerebral lesions. These square wave jerks were significantly lower in amplitude than those in cerebellar system disease. The metrics of these jerks were uniform regardless of the site of cerebral damage. Mean durations approximated the reaction time for saccadic refixations triggered by visual feedback. Very short-latency corrective saccades in some patients are attributed to internal (nonretinal) feedback of eye position errors. Low-amplitude cerebral square wave jerks can be detected clinically by funduscopy.
17例急性或慢性局灶性脑损伤患者中，70%出现异常扫视侵入，表现为频繁的散发性水平扫视，间隔一段时间后跟随矫正性扫视。这些方波急跳的幅度明显低于小脑系统疾病中的幅度。无论脑损伤部位如何，这些急跳的指标都是一致的。平均持续时间接近视觉反馈触发的扫视重新注视的反应时间。一些患者中非常短潜伏期的矫正性扫视归因于眼位误差的内部（非视网膜）反馈。低幅度的脑源性方波急跳可通过眼底镜检查在临床上检测到。
