伸手抓取動作之身體尺度比率界限

Body Scaled Boundary Ratios for reach-to-grasp Movement

10.6222/pej.4203.200909.0905

彭國威(Wayne Gwo-Wei Peng)；卓俊伶(Hank Jwo)；楊梓楣(Chih-Mei Yang)

伸手抓取 ； 直接知覺 ； 身體尺度訊息 ； 環境賦使 ； reach-to-grasp ； direct perception ； body-scaled information ； affordances

體育學報

42卷3期（2009 / 09 / 01）

63 - 75

繁體中文

Purpose: Exploring the body-scaled boundary ratios for reach-to-grasp cylinders of hand aperture and the movement time of transport phase, so as to examine the effect of body-scaled information for direct perception perspective on the reach-to-grasp movement. Methods: Sixteen participants (26.3±6.5 years) were recruited. Cylinders (2, 4, 6, 8, 10, and 12 cm in diameter) were used as target objects with counterbalancing for the range sequence. Each object was carried out for 10 trials. Six degrees of freedom Polhemus LIBERTY and MotionMonitor software were used to collect kinematics data. Results: One-way ANOVA with repeated measures revealed that significant difference (p＜.05) for the hand aperture remain distance was found, when participants reaching-to-grasping various size of cylinders. Reach-to-grasp movement was influenced by body-scaled information of diameter-hand and the boundary ratio ranged from 0.34 to 0.51; and significant difference (p＜.05) was also found for transport phase movement time to whole movement time. The transport movement time of reach-to-grasp was influenced by body-scaled information and the boundary ratio ranged from 0.51 to 0.67. Conclusions: Individual picks up the body-scaled information from affordances directly for reach-to-grasp movement, besides body-scaled boundary ratios of hand's parameters, and transport movement time within unique ranges.

Purpose: Exploring the body-scaled boundary ratios for reach-to-grasp cylinders of hand aperture and the movement time of transport phase, so as to examine the effect of body-scaled information for direct perception perspective on the reach-to-grasp movement. Methods: Sixteen participants (26.3±6.5 years) were recruited. Cylinders (2, 4, 6, 8, 10, and 12 cm in diameter) were used as target objects with counterbalancing for the range sequence. Each object was carried out for 10 trials. Six degrees of freedom Polhemus LIBERTY and MotionMonitor software were used to collect kinematics data. Results: One-way ANOVA with repeated measures revealed that significant difference (p＜.05) for the hand aperture remain distance was found, when participants reaching-to-grasping various size of cylinders. Reach-to-grasp movement was influenced by body-scaled information of diameter-hand and the boundary ratio ranged from 0.34 to 0.51; and significant difference (p＜.05) was also found for transport phase movement time to whole movement time. The transport movement time of reach-to-grasp was influenced by body-scaled information and the boundary ratio ranged from 0.51 to 0.67. Conclusions: Individual picks up the body-scaled information from affordances directly for reach-to-grasp movement, besides body-scaled boundary ratios of hand's parameters, and transport movement time within unique ranges.

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