Page:Freud - Wit and its relation to the unconscious.djvu/334

 at me, I put my body in states of tension in order to enable me to withstand the collision with the ball, and the superfluous motions which I make if the ball turns out to be light make me look comical to the spectators. I allowed myself to be misled by the expectation to exert an immoderate expenditure of motion. A similar thing happens if, for example, I lift out a basket of fruit which I took to be heavy but which was hollow and formed out of wax in order to deceive me. By its upward jerk my arm betrays the fact that I have prepared a superfluous innervation for this purpose and hence I am laughed at. In fact there is at least one case in which the expectation expenditure can be directly demonstrated by means of physiological experimentation with animals. In Pawlof’s experiments with salivary secretions of dogs who, provided with salivary fistulæ, are shown different kinds of food, it is noticed that the amount of saliva secreted through the fistulæ depends on whether the conditions of the experiment have strengthened or disappointed the dogs’ expectation to be fed with the food shown them.

Even where the thing expected lays claims only to my sensory organs, and not to my motility, I may assume that the expectation manifests itself in a certain motor emanation causing