Judging where a ball will go: the case of curved free kicks in football |
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Authors: | Cathy M Craig Eric Berton Guillaume Rao Laure Fernandez Reinoud J Bootsma |
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Institution: | (1) Movement and Perception, University of the Mediterranean, Marseille, France;(2) School of Psychology, Queen’s University Belfast, Belfast, Northern Ireland |
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Abstract: | This study examined whether adding spin to a ball in the free kick situation in football affects a professional footballer’s
perception of the ball’s future arrival position. Using a virtual reality set-up, participants observed the flight paths of
aerodynamically realistic free kicks with (±600 rpm) and without sidespin. With the viewpoint being fixed in the centre of
the goal, participants had to judge whether the ball would have ended up in the goal or not. Results show that trajectories
influenced by the Magnus force caused by sidespin gave rise to a significant shift in the percentage of goal responses. The
resulting acceleration that causes the ball to continually change its heading direction as the trajectory unfolds does not
seem to be taken into account by the participants when making goal judgments. We conclude that the visual system is not attuned
to such accelerated motion, which may explain why goalkeepers appear to misjudge the future arrival point of such curved free
kicks.
Electronic Supplementary Material Supplementary material is available for this article at . |
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Keywords: | |
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