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Marieke Rohde, Marc O. Ernst; Back to the Future: Recalibration of visuomotor simultaneity perception to delayed and advanced visual feedback. Journal of Vision 2012;12(9):135. doi: 10.1167/12.9.135.
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© 2017 Association for Research in Vision and Ophthalmology.
Perceived simultaneity is subject to change through recalibration. Thereby, the brain compensates for small temporal discrepancies. This has been shown, e.g., for visuoauditory, visuotactile and even for visuomotor events. Visuomotor recalibration has so far only been investigated for visual stimuli that follow voluntary motor actions. Here we ask whether visuomotor recalibration can occur in both directions, to compensate not only for visual stimuli following a motor action but also for stimuli preceding the action, which violates the underlying cause-effect relationship. To this end, we manipulated the temporal relationship between a motor action (a button press) and a visual event (a flash) triggered by this action. The effect of recalibration to a constant delay of ±100 ms was determined using a temporal order judgment task. Participants’ perceived simultaneity (PSS) was compared before and after recalibration. To be able to present visual stimuli before the full compression of the button, the time of this event had to be predicted. This was achieved using a virtual button, displayed with a Phantom force-feedback device, so finger motion could be recorded and analyzed online. An adaptive threshold predictor estimated the moment of the full compression of the button in real-time from early movement onset. We found a significant recalibration of PSS in both the delayed feedback (-16±6ms, SEM) and in the advanced feedback (26±7ms, SEM) conditions (p<0.05). Since the prediction method contained some amount of temporal uncertainty, we also analyzed the strength of the recalibration effect as a function of this uncertainty. Interestingly, there was a trend showing less recalibration with increasing temporal uncertainty in the predictor. Taken together these results show that visuomotor recalibrations can occur for both delayed and advanced visual stimuli, irrespective of the causal asymmetry that says visual stimuli that precede a voluntary action cannot be caused by this action.
Meeting abstract presented at VSS 2012
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