The relative timing between eye and hand in rapid sequential pointing is affected by time pressure,but not by advance knowledge |
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Authors: | F J A Deconinck V van Polanen G J P Savelsbergh S J Bennett |
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Institution: | (1) Institute for Biomedical Research into Human Movement and Health, Manchester Metropolitan University, John Dalton Building, Oxford Road, Manchester, M1 5GD, UK;(2) Department of Movement and Sports Sciences, Ghent University, Ghent, Belgium;(3) Department of Physics of Man, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands;(4) Research Institute MOVE, VU University Amsterdam, Amsterdam, The Netherlands;(5) Research Institute for Exercise and Sport Sciences, Liverpool John Moores University, Liverpool, UK |
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Abstract: | The present study examined the effect of timing constraints and advance knowledge on eye–hand coordination strategy in a sequential
pointing task. Participants were required to point at two successively appearing targets on a screen while the inter-stimulus
interval (ISI) and the trial order were manipulated, such that timing constraints were high (ISI = 300 ms) or low (ISI = 450 ms)
and advance knowledge of the target location was present (fixed order) or absent (random order). Analysis of eye and finger
onset and completion times per segment of the sequence indicated that oculo-manual behaviour was in general characterized
by eye movements preceding the finger, as well as ‘gaze anchoring’ (i.e. eye fixation of the first target until completion
of the finger movement towards that target). Advance knowledge of future target locations lead to shorter latency times of
eye and hand, and smaller eye–hand lead times, which in combination resulted in shorter total movement times. There was, however,
no effect of advance knowledge on the duration of gaze anchoring. In contrast, gaze anchoring did change as a function of
the interval between successive stimuli and was shorter with a 300 ms ISI versus 450 ms ISI. Further correlation analysis
provided some indication that shorter residual latency is associated with shorter pointing duration, without affecting accuracy.
These results are consistent with a neural mechanism governing the coupling of eye and arm movements, which has been suggested
to reside in the superior colliculus. The temporal coordination resulting from this coupling is a function of the time pressure
on the visuo-manual system resulting from the appearance of external stimuli. |
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