Abstract
The changes of reflex response observed when varying strength, duration and frequency of artificial stimuli applied to an afferent nerve, have been compared for spinal, vagorespiratory and Hering's nerve reflexes. Modification of reflex effect due to involvement of different types of afferent fibres exists for the vagal inspiratory reflex and for antagonistic cardio-vascular responses to stimulation of Hering's nerve. Reflex reversal due to varying rate of impulses in one and the same group of afferent fibres applies for Hering-Breuer reflexes brought about by the ordinary pulmonary stretch receptors. It may also be accepted for ipsilateral spinal inhibition. The fibre-type as well as the frequency-effect principle can be responsible for qualitative change in reflex control. A complete analysis of reflex efficacy of afferent stimulation can only be done with simultaneous action current recording from the stimulated nerve and must take into account the anatomical arrangement and functional properties of the specifically different reflex centres involved.
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