Demonstration of sound-induced changes in visual motion perceptionThe sounds were desirable to be provided through headphones or earphones. Please fixate firmly your eyes on the red circle when it appears; otherwise you will perceive illusory horizontal motion even without sound presentation. A white square moves alternately up and down without sounds in the first three sequences. In the second three sequences, the sounds alternate between the left and right ears. Then, the white square appears to move laterally or obliquely although it actually moves vertically. In the following, the sounds were presented every three sequences, and sometimes the white square actually moves horizontally. However, it may be difficult to distinguish this from the sound-induced illusory motion.