Problems : E. R. GUTHRIE & G. P. HORTON considered that cats' behavior immediately before escape was stereotyped and in part the variety of the behavior depended upon (1) the delicate change of stimulus-situation and (2) the difference of the way of approaching the stimulus. Our result was just the same. These two problems have been variously explained by many writers as the problems of cues in learning. But we planned first of all the analysis of organism itself, and studied especially the effect of the excitement of the autonomic nerves on animals' behavior.
Apparatus : Revolving wheel.
Animals : 22 mice _??_, each 15g.
Stimulants : Adrenalin 10^-5 for sympathetic nerve.
Acetylcholine 10^-5 for parasympathetic nerve.
Method : After hypodermic injection, the rate of revolving for 30 minutes was recorded.
Result : When the sympathetic nerves were excited, animals' behavior was restrained; and when the parasympathetic nerves were excited, an accelerative effect resulted. Thus the effect of these drugs on the autonomic nerves seemed to be an.important element in animals' behavior.