FIG. 2.

Surface EMG from ipsilateral and contralateral muscles. Surface EMG from soleus, tibialis anterior, vastus lateralis, hamstrings, and ankle joint position (top to bottom) recorded during typical clonus of long (A) and intermediate (B) duration. (C) Short-duration clonus included activation of contralateral muscles. Data are from three different subjects. Each spasm stopped naturally. The inset in A magnifies the signals from seven clonus cycles. (D, E) Symbols show the duration of each cycle, interburst, and burst for the spasms shown in A and B, respectively.