Abstract
Strong support is given to the thesis that an unmodulated level of pheromone does not evoke orientation toward the source in male silkmoth Bombyx morieven if the concentration is high. The bombykol-related compound (Z,E)-4,6-hexadecadiene, which is known to elicit a firing of bombykol receptors that is maintained for many minutes after the removal of the stimulus, was used for the tests, together with linalool, which inhibits the response of the bombykol cells. Neither hexadecadiene nor linalool is known to release the typical behavior of orientation in these moths. The experiments, however, show that if the uniform firing after a hexadecadiene stimulus is modulated by a suitable sequence of linalool pulses, the males immediately display orientation behavior and approach the source even faster and more directed than with pulsed bombykol.
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