Visual behaviour of tennis coaches in a court and video-based conditions. (Análisis del comportamiento visual de entrenadores de tenis en situaciones de pista y videoproyección.)

Abstract

This study analyses the visual behaviour performed by tennis coaches with different levels of experience, when they shown a second top-spin serves in a video-based and court situa- tions during a performance error detection process. The ASL SE5000 eye tracking system was used to detect and record the point of gaze in the visual field. Three experimental mea- sures were carried out (A-B-A'): a two-dimensional situation in a laboratory (2D), a three-dimensional situation on court (3D) and another two-dimensional situation in a laboratory conditions (2D'). The visual fixations performed by the expert coaches were lesser than the novice ones in all conditions. Between the two video-based conditions, the coaches performed longer visual fixations in the second one, with greater differences in the experienced group. Both groups performed the highest num- ber of visual fixations on the upper body, with higher scores by the novice group. The location with longer fixation time was the upper body, whereas the location with shorter fixa- tion time was the ball. The number of visual fixations for both groups decreases as they participated in the experimental situations. Two variables have been found to be affec- ted by the dimensionality of display: the number of visual fixations on the perform-arm and the time of visual fixation on the upper-body