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Action and perception: Evidence against converging selection processes
BONFIGLIOLI, C., DUNCAN, J., RORDEN, C. & Kennett, S.
Visual Cognition, 9, 458-476
Year of publication:
In a series of experiments we investigated whether identification of a lateralised visual target would benefit from concurrent execution of a reaching movement on the same side of space. Participants were tested in a dual task paradigm. In one task, they performed a speeded reach movement towards a lateralised target button. The reach was cued by an auditory stimulus, and performed out of the participant's sight. In the other task, participants identified one of two simultaneous visual stimuli presented to the left and right visual fields, close to movement target locations. If motor activity were effective in modulating perceptual processes via a visuo-attentional shift, identification performance should have improved when the visual stimulus appeared at the movement target location. In fact, identification was not affected by the side of reach. Such results suggest substantially independent selection processes in motor and visual domains.