| 摘 要： | Quantitative analyses on phonotactic behavior of the bushcricket havedemonstrated that the bushcricket possesses good capability to determine directionof sound source.The morphological structure,laterality and directional sensitivityof the auditory ascending neuron in the prothoracic ganglion of the bushcrickethave been studied.At its best frequency of 15 kHz,the laterality threshold differ-ence of the neuron is great up to about 16 dB.Its directional sensitivity dependsclosely on stimulus frequency.The higher the stimulus frequency,the greater thedirectional threshold differences.Spike count and latency shift of the ascendingneuron in response to each stimulus depend on the angle of incidence of sound.Therefore,the two parameters can be used as directional cues of sound source bythe ascending neuron.
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