Figure 5.

TVR responses in decerebrate cat follow similar trends to paretic elbow flexors post-stroke as preactivation increases. Each colored line represents the force evoked in response to a single TVR trial at a given level of preactivation. Crossed extension reflex is initiated prior to vibration onset (t = 0 s) to achieve a stable preactivation force and is maintained throughout the duration of vibration. Y-axis: evoked force (Kg); x-axis: time (sec); black arrows: vibration offset. TVR-evoked force amplitude exhibits negligible change with increased preactivation, and involuntary force production is maintained after cessation of vibration (black arrows) and until peroneal nerve stimulation is stopped.