The sooner you decide, the better you can localize

When an object moves while rotating, the position of the object appears to shift in the direction of rotational motion (curveball illusion). Although this illusion occurs perceptually, no effect on saccadic eye movements has been observed. Here, we studied why only perception (but not eye movement) is susceptible to the illusion. We found that, regardless of perception or eye movement, the size of illusion was small when the elapsed time from visual input to response was short and was large when the elapsed time was long. This indicates that the timing of judgment is important when localizing moving objects and it does not necessarily improve even if a long time is spent.
The present study shows the importance of the time from the input of visual motion to decision making. These findings would be useful to make applications for athletes' training and UI design encouraging appropriate perceptual judgment and motor response to visual signals.

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