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Geoffrey.walsh
06-23-1999, 05:14 AM
I have been watching Wimbledon on TV.

When a serve is about to be delivered the player at the other end
invariably makes some preparatory movements.

These consist of a sideways rhythmic motion of the torso, apparently
most of the movement being at the hips.

The rate is perhaps 1 Hz

What advantage is there in doing this. ?

I can think of two possibilities.

1. It keeps the leg muscles ready for action and

2. It provides optical parallax thus enhancing distance perception

Are either of these explanations correct ?

--
Email— Geoffrey.Walsh@ed.ac.uk
http://www.ed.ac.uk/~gwalsh
Phone (0)131.664.3046

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