執行攔截動作時，知覺判斷與時宜控制是影響動作表現的重要因素，然而，接球者究竟根據何種訊息完成動作，目前為止仍無一致定論，因此本研究以十位大學男生為對象，根據其接球型態與運動經驗分成生手與熟手各五位，進行拋物線軌跡的接球測驗，並以高速攝影機（120Hz）及Kwon 3D動作分析軟體收集與分析參數資料，以接球者手啟動瞬間之球與眼睛的距離除以球的瞬時速度計算tau值後，以獨立樣本單因子變異數分析考驗不同受試者tau值的差異情形，並採杜凱氏法進行試後比較，透過相依樣本t考驗個別比較兩階段測驗及不同來球速度下tau值的差異情形，以獨立樣本t考驗比較生手與熟手時宜控制及接球成功率差異情形，研究結果顯示：不同受試者的tau值有顯著差異；其中四位受試者面對慢速球之tau值顯著大於面對快速球之tau值；生手與熟手之時宜控制情形未達顯著差異；熟手之接球成功率顯著高於生手。本研究之結果證實τ訊息的存在，但不是任何人都能覺察到並加以利用，而且，時宜控制之情行亦非影響接球成功率的唯一因素。

When executing interceptive movements, perception and timing control played important roles. However, there was no consistent agreement about what kind of information did a catcher use to conduct the motion. Thus, we adapted ten male college students (five experts and five beginners) to join the study of one-hand ball catching. A mega speed camera (120Hz) and the Kwon 3D motion analysis system were used to collect and analyze the kinematics parameters. And then the tau values (the quotient of the distance between the eye of the catcher and the ball and its rate of change) were calculated by these data. The study adapted one-way ANOVA to examine the difference among all subjects. If there were noticeable diversity, Tukey’s post hoc procedure would be applied. The study also examined the difference of tau values of the two stages and different speed according to paired t-test or not. Besides, the difference of timing control and strike-rate between experts and beginners were both examined by independent sample t-test. The results were as follows：First, there were obvious differences on the tau values among all subjects. Second, the tau values of slow-speed balls were significantly large than fast-speed balls. Third, there were no obvious difference on timing control between experts and beginners. Last, the strike-rate of experts were significantly better than the one of beginners.

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