Quiet eye and motor performance: The longer the better?

Hossner, Ernst-Joachim (28 August 2017). Quiet eye and motor performance: The longer the better? In: European Conference on Visual Perception 2017. Abstractband. Berlin. 28.08.2017-31.08.2017.

In targeting tasks, the final fixation duration before movement initiation (i.e., Quiet Eye, QE) has been shown to be a valid predictor of the subsequent motor performance. However, the exact shape of the QE-performance relation is still unknown. Therefore, in the current series of studies, the QE duration was experimentally manipulated with the aim to evoke eight different QE-duration conditions ranging from 400 ms to 3200 ms. The participants’ task was to throw a ball as accurately as possible at a virtual target disk. Motor performance (radial error, mm) and QE duration (ms) were assessed with a Vicon system (200 Hz) and an integrated eye tracker (EyeSeeCam, 220 Hz). While results showed successful QE-duration manipulations, participants denied to maximize their QE duration as intended to 3200 ms (min. 320 ms, max. 1785 ms). Likewise, significant main effects were found for radial error with on average inferior performance in short when compared to the long QE duration conditions (M = 165 mm vs. M = 140 mm) which, however, did not significantly differ from each other. On the one hand, these results emphasize the functional coupling between perception and action as the demands of the motor task restricted the intended maximization of the QE-duration manipulation. On the other hand, the relation between the QE and performance seems to be best described by an exponential function with performance deterioration in short but no further performance improvements the longer the QE duration.

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