Abstract
Recent studies have shown that auditory signals can induce motion perception of a static visual stimulus,
or ‘Sound-Induced-Visual-Motion’ [SIVM; Hidaka et al., 2009, 2011]. Here we explore in two
experiments whether motor movements can also change perceived visual motion. In Experiment 1,
participants judged the direction of two flashing horizontal bars that either moved upward or downward
(with 0.1; 0.4; 0.7 or 1.0 deg vertical bar displacement). For testing the effect of co-occurring
motor movements of the hand, participants were instructed to make two button-presses, either upward
(right thumb on lower button followed by right index on upper button) or downward (up-down),
and the visual bars were presented at the timing of the button-presses. The results demonstrate overall
more upward responses when the motor movement was upward and more down-ward responses
when moving downward confirming a ‘Motor-Induced-Visual-Motion’ (MIVM). In Experiment 2,
the role of response bias was excluded in a d
prime paradigm in which each trial consisted of 6 flashing
vertical bars that were either moving (left–right–left, etc.) or static. Participants judged whether
the bar was moving or static. Participants performed a moving motor-movement (left hand index button
press followed by right hand index button press), a static motor movement (pressing twice with
left or right index) or no motor movement (visual condition). Results showed more illusory motion
(lower d
prime) when participants performed a moving motor movement as compared to the static or
no motor movement conditions. Together these two experiments demonstrate Motor-Induced-
AbstractRecent studies have shown that auditory signals can induce motion perception of a static visual stimulus,or ‘Sound-Induced-Visual-Motion’ [SIVM; Hidaka et al., 2009, 2011]. Here we explore in twoexperiments whether motor movements can also change perceived visual motion. In Experiment 1,participants judged the direction of two flashing horizontal bars that either moved upward or downward(with 0.1; 0.4; 0.7 or 1.0 deg vertical bar displacement). For testing the effect of co-occurringmotor movements of the hand, participants were instructed to make two button-presses, either upward(right thumb on lower button followed by right index on upper button) or downward (up-down),and the visual bars were presented at the timing of the button-presses. The results demonstrate overallmore upward responses when the motor movement was upward and more down-ward responseswhen moving downward confirming a ‘Motor-Induced-Visual-Motion’ (MIVM). In Experiment 2,the role of response bias was excluded in a dprime paradigm in which each trial consisted of 6 flashingvertical bars that were either moving (left–right–left, etc.) or static. Participants judged whetherthe bar was moving or static. Participants performed a moving motor-movement (left hand index buttonpress followed by right hand index button press), a static motor movement (pressing twice withleft or right index) or no motor movement (visual condition). Results showed more illusory motion(lower dprime) when participants performed a moving motor movement as compared to the static orno motor movement conditions. Together these two experiments demonstrate Motor-Induced-
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