Most movements executed in sport performance and everyday life are aimed at visual objects and are controlled visually. The role of visual feedback in control of movements has been a central issue in the study of motor behavior since Woodworth`s research in 1899. The time required to identify, decide, and initiate within-movement corrections based upon visual feedback has been called visual feedback processing time. The estimated visual processing time in most early experiments is about 250-300msec. However, there have been several evidences suggesting that visual feedback could be processed and used in lesser time. The evidences for faster visual processing time comes from the selective exclusion of visual feedback, the control of saccadic eye movement, and the analysis of movement trajectory. These experiments estimated that the visual processing time is about 120msec or less.

• 이강헌 | Kang Hun Lee
• 정청희 | Chung Hee Chung