![]() It will be interesting for further researches to investigate if the methodology used in the experiment 2 allows assessing the effect of sensori-motor deficits on gaze-hand coordination. Moreover, our data clearly illustrate the smooth adaptation of temporal gaze-hand coordination to terminal accuracy requirements during fast reciprocal pointings. Overall, the temporal gaze-hand coordination analysis revealed that even for high IDs, fast reciprocal pointings could not be considered as a concatenation of discrete units. Moreover, while it was constant for discrete pointings, it decreased systematically with an increasing ID for reciprocal pointings because of the longer duration of gaze anchoring on target. ResultsÄata showed that the magnitude of the gaze-hand lead pattern was much higher for discrete than for reciprocal pointings. Temporal gaze-hand coordination parameters were compared between experiments (discrete and reciprocal pointings) and IDs using analyses of variance (ANOVAs). Gaze and hand displacements were synchronously recorded. Subjects performed fast discrete (experiment 1) and reciprocal (experiment 2) pointings with an amplitude of 50 cm and four target diameters (7.6, 3.8, 1.9 and 0.95 cm) leading to indexes of difficulty (ID = log 2) of 3.7, 4.7, 5.7 and 6.7 bits. The objectives of this work were to assess the effect of the target size on temporal gaze-hand coordination during fast 1) discrete and 2) reciprocal pointings. Moreover, goal-directed movements are often produced in a reciprocal rather than in a discrete manner. Surprisingly, the effect of the target size on the temporal gaze-hand coordination has not been directly investigated. The gaze always starts prior to the hand movement and reaches the target before hand velocity peak. ![]() ![]() Rapid discrete goal-directed movements are characterized by a well known coordination pattern between the gaze and the hand displacements. ![]()
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