Antennal and locomotor responses to attractive and aversive odors in the searching cockroach |
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Authors: | Katsuhiro Nishiyama Jiro Okada Yoshihiro Toh |
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Institution: | (1) Department of Biology, Graduate School of Sciences, Kyushu University, Fukuoka 812-8581, Japan |
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Abstract: | The behavioral responses to attractive and aversive odors were examined in blinded adult male cockroaches under tethered-walking
conditions. A sex pheromone-like stimulant derived from adult virgin females and artificially synthesized limonene were used
as attractive and aversive odor sources, respectively. When a searching animal was stimulated with the attractive female-derived
odor, the horizontal deflections of both the antennae were increased, and in most cases the vertical antennal positions were
shifted downward. The stimulation also significantly decreased the walking speed of the animal. These behavioral changes imply
a careful search in the immediate surroundings. The aftereffect of the sex pheromone was more pronounced on locomotion than
on antennal movement. On the other hand, stimulation with the aversive odor (limonene) tended to suppress active antennal
movement, and also increased the walking speed. Immediately after the withdrawal of the aversive odor, the active movement
of the antennae was resumed, and the walking speed rapidly decreased to a level approximately the same as that of the control
period. These results indicate that the responses to the qualitatively opposite types of odor are reciprocal to each other
with regard to both antennal movement and locomotion. |
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Keywords: | Cockroach Antenna Locomotion Searching Olfaction |
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