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Fig. 1. (A) Experimental arrangement for measuring cricket phonotaxis. The animal
was fixed on top of a trackball and during walking rotated the trackball with
its legs. An optical sensor aligned below the trackball (not shown) monitored
the forward–backward and left–right trackball movements. Speakers
at a distance of 87 cm were arranged at 45 deg off the animal's length axis.
(B) Simultaneous recording of the forward–backward and left–right
movement component of a walking cricket, as picked up from the rotating
trackball. From these two components, the translational velocity of the animal
was calculated as well as the lateral deviation of the path and the total path
length. (C) The step cycle of a foreleg recorded with an optoelectronic camera
(Hedwig, 2000) and the
translation velocity of a walking cricket. Due to the insect tripod gate the
movement of the foreleg was in phase with every other peak in the velocity
signal.
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