tailieunhanh - Báo cáo hóa học: " Effect of terminal accuracy requirements on temporal gaze-hand coordination during fast discrete and reciprocal pointings"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Effect of terminal accuracy requirements on temporal gaze-hand coordination during fast discrete and reciprocal pointings | Terrier et al. Journal of NeuroEngineering and Rehabilitation 2011 8 10 http content 8 1 10 Hill JOURNAL OF NEUROENGINEERING NCR AND REHABILITATION RESEARCH Open Access Effect of terminal accuracy requirements on temporal gaze-hand coordination during fast discrete and reciprocal pointings I-X -I- 13 2 2 Romain Terrier1 Nicolas Forestier Felix Berrigan Mathieu Germain-Robitaille Martin Lavallière Normand Teasdale2 Abstract Background Rapid discrete goal-directed movements are characterized by a well known coordination pattern between the gaze and the hand displacements. The gaze always starts prior to the hand movement and reaches the target before hand velocity peak. Surprisingly the effect of the target size on the temporal gaze-hand coordination has not been directly investigated. Moreover goal-directed movements are often produced in a reciprocal rather than in a discrete manner. 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. Methods Subjects performed fast discrete experiment 1 and reciprocal experiment 2 pointings with an amplitude of 50 cm and four target diameters and cm leading to indexes of difficulty ID log2 2A D of and bits. Gaze and hand displacements were synchronously recorded. Temporal gazehand coordination parameters were compared between experiments discrete and reciprocal pointings and IDs using analyses of variance ANOVAs . Results Data showed that the magnitude of the gaze-hand lead pattern was much higher for discrete than for reciprocal pointings. 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. Conclusion Overall the temporal gaze-hand coordination analysis revealed that even for high IDs fast reciprocal pointings could not be .