DO FIELDERS KNOW WHERE TO GO TO CATCH THE BALL OR ONLY HOW TO GET THERE

Skilled fielders were filmed as they ran backward or forward to catch balls projected toward them from a bowling machine 45 m away. They ran at a speed that kept the acceleration of the tangent of the angle of elevation of gaze to the ball at 0. This algorithm does not tell field ers where or when the ball will land, but it ensures that they run thr ough the place where the ball drops to catch height at the precise mom ent that the ball arrives there. The algorithm leads to interception o f the ball irrespective of the effect of wind resistance on the trajec tory of the ball.