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Figure 2


Fig. 2. Measurement of the escape response. Locomotor activity was studied in a walking simulator device consisted of a styrofoam ball that could be freely rotated by the animal. The crab was held in position by a weightless rod attached to its carapace that could move freely up and down within a vertical guide located above the crab. Both the rod and the guide sleeve had square cross-sections, which prevented the animal from rotating around its yaw axis. The horizontal position of the floating ball was stabilized by four contact points separated by 90° and provided by two optical mice and two flexible sheets. Locomotion was assessed by recording the rotations of the ball with the two mice according to the method described in the text (see also Fig. 1).





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