Physiology vs. Psychology

That the first period of the delayed reflex is indeed a period of inhibition is proved by a series of facts. in the first place, inhibition of the delayed reflex can easily be summated. And again, from the delayed reflex one can observe successive inhibiti­on. And finally, the drowsy and sleepy state which comes out in some animals in the first part of the delayed reflex is a striking expression of the state of inhibition.