Definition of human reflex excitability by statistical analysis of quantal EMG responses.

A precise method has been devised to estimate soleus motoneurone pool excitability by probit analysis of quantal (all-or-none) reflex EMG responses to critical electrical stimulation. The technique is shown to be sensitive to changes induced by weak excitatory or inhibitory inputs and is likely to be useful in the study of monosynaptic proprioceptive reflexes.