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Fig. 2. Example of a tail-flip response and response patterns for different
shadows. (A) An example of a tail-flip response of a crayfish exposed to a
slow shadow. Shown are (1) the animal in the start compartment shortly after
the experiment was started, (2) the animal in the tunnel walking towards the
food odor release point and approaching the bath electrodes, (3) the animal
producing a tail-flip in response to the shadow and (4) the animal in its
final position after completing the tail-flip. (B) Patterns of behavior in
response to shadows of different velocities. The number of tail-flips
decreases with increasing shadow velocity while the number of stops increases.
The differences in response pattern are statistically significant
(*P
0.01).
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