DATA SET 6: Mike Land's Cricket Playing Data SetEXPERIMENT DESCRIPTION
By knowing the time from delivery to bounce, and the declination angle of the bounce point, a batsman can determine when the ball will reach the bat, and the height it will be at that time. This information will allow him to produce an accurate, well-timed stroke. The key to this is an early, reasonably accurate, anticipatory saccade. We found that good players have a latency of only about 130 ms for such saccades, but weaker players may be up to 100 ms later.
Fig 1: Upper part: The batsmanís view of the ball leaving a bowling machine. (1) Ball about to emerge, batsmanís gaze (white dot, 1º across) watching the aperture. (2) Ball (small black dot) descending from the aperture with gaze starting to follow. (3) Gaze saccade to a spot close to the bounce point, which the ball will not reach for a further 0.1 s. Object in centre of each frame is a camera tripod. Lower part, main graph. Vertical direction of gaze (●) and ball (○) viewed from the batsmanís head. Numbers correspond to photographs above. Note that the saccade after 2 brings gaze close to the bounce point. After the bounce gaze tracks the ball until about 0.6 s after delivery. The ball is struck at 0.7 s. Upper graph: difference between gaze and eye direction. Note that the batsman must take his eye off the ball by about 51 in order to anticipate the bounce.
SCANPATH (EYE-TRACKER) DATA