Sound localization in intact and one-eared crickets.

Autor: Schildberger, K., Kleindienst, H.
Zdroj: Journal of Comparative Physiology A: Sensory, Neural & Behavioral Physiology; Nov1989, Vol. 165 Issue 5, p615-626, 12p
Abstrakt: Intact and one-eared crickets, Gryllus bimaculatus, were tested for phonotactic behavior in a closed-loop and an open-loop situation and for related physiological characteristics of an identified auditory neuron pair, the left and the right AN2. Intact animals that performed phonotaxis in the closed-loop condition showed intended turning tendencies in the open-loop condition that correlated with the directional characteristics of their AN2s (Figs. 1-3). Animals in which one foreleg had been amputated during postembryonic development (one-eared regenerates) were classified according to their phonotactic performance as tracking or unoriented animals. The ability of one-eared regenerates to track a sound source was closely correlated with the direction of turning tendencies in the open-loop behavior and to specific features of their AN2 pair (Figs. 4-6). Some animals with one foreleg amputated as adults (one-eared amputees) perform stable phonotactic walking. Their open-loop behavior, however, is different from that of the tracking one- eared regenerates (Fig. 7). One-eared amputees showed stable phonotactic walking when calling song was presented from above and the sound intensity was varied according to the actual walking angle of the animal. The only orientational cue under this condition is the difference of sound intensity at different walking directions (Figs. 8-11). Different mechanisms are discussed for sound localization in one-eared regenerates and one- eared amputees based on turning tendencies which depend on the instantaneous stimulus intensity or on the intensity change between successive stimuli. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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