Abstract
A computerized technique has been used for the analysis of F responses in normal subjects. Differences between the dominant and non-dominant upper limb have been found in some subjects and potentiation of the F response by the Jendrassik manoeuvre has been demonstrated. The recovery cycle of the F response has been studied in human subjects and in the rat and has been found to be similar to that of the H reflex. Such studies may be useful for studying alpha motor neurone excitability.