The nature of the trace of apparent movement was investigated by making use of the phenomenon of neutralization concerning propagation of retinal induction discovered by Motokawa. Experiments were conducted in the right visual field as well as in the binocular field composed of the independent monocular ones, that is to say, under the two conditions ; when apparent movement was caused monocularly, and when binocularly. Findings are as follows. The indirect induction does not traverse the trace of apparent movement resulted by the successive presentation of white luminous rectangles, no matter whether monocularly or binocularly they may be viewed. Moreover the trace of apparent movement has the reflecting effect upon the propagating induction.