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letters to nature 690 NATURE |VOL 410 |5 APRIL 2001 |www.nature.com

Summary: letters to nature
690 NATURE |VOL 410 |5 APRIL 2001 |www.nature.com
controlled by computer.
For comparison of response latencies, freely walking ¯ies were recorded using a Redlake
Motionscope high-speed video recorder at 1,000 frames s-1
. Stimulus generation was as
described above.
Localization and lateralization tasks
Stimulus duration was constant across all presentations, and the response of the ¯y did not
modify the stimulus in any way (that is, the task was open loop). Unlike closed-loop
stimulus conditions, in which the directional stimulus would decrease as the ¯y
approached the angle of the speaker, here the angle of the speaker relative to the ¯y was
®xed, and the ¯y received a constant turn signal throughout the stimulus. Therefore the
¯y's movements that generate the measured turn angles in these experiments could not
bring them to face the direction of the speaker (turn angles should overshoot the actual
speaker position). If the ¯ies were simply lateralizing the stimulus source they would
receive a constant turn signal (right or left) for the duration of the stimulus, and the angle
of the ¯ies' paths relative to the midline axis should be similar for all speaker positions. If
the ¯ies were truly localizing the sound source then paths for different speaker positions
should be consistently different from one another and turn angle should increase with


Source: Anderson, Barton L. - School of Psychology, University of Sydney
van Ee, Raymond - Faculty of Physics and Astronomy, Universiteit Utrecht


Collections: Biology and Medicine; Physics