I call this the staircase illusion, and actually when the staircase illusion abruptly ended, he froze, and this is called freezing of gait.

我把这种称为阶梯假象，实际上，当阶梯假象突然结束了，他就会停住了，这叫做步态冻结。

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Aim: to explore the characteristics of a group of movement disorders which showed primary symptom of freezing gait.

目的：探讨以冻结步态为首发症状的一组运动障碍性疾病的临床特点。

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