Figure 3 Upper panel: effect of lying in a nest on occurrence of frozen postures of arms and legs. ARM‐FR‐FL, arms in frozen flexion and fisting; LEGS‐EXT, legs in frozen extension. Lower panel: effect of lying in a nest on the occurrence of abrupt movements. ABD‐EXT, abrupt abduction–extension movements of the arms; Open hand, abrupt opening of hands and fingers; Startle, abrupt abduction–extension of the four limbs; Rolling, abrupt rolling to side. *p<0.05, **p<0.01 (Wilcoxon's signed rank test).