488 W. MCDOUGALL : FACTOES OF THE ATTENTION-PEOCESS.

rones that bring about the corresponding eye-movement and which are in turn excited by such eye-movements. In some such way as this we must seek to explain the effects of motor-activities in determining the mode of atten- tion. In the following section I propose to bring forward experimental evidence that the motor-effects or accompani- ments of sensory perception have not that predominant or exclusive importance with which they have been credited by

several authors.