Sensitivity to ultrasound in an identified auditory interneuron in the cricket: a possible neural link to phonotactic behavior

摘要: 1. In the cricket,Teleogryllus oceanicns, an identified auditory interneuron, interneuron-1 (int-1), is described morphologically and physiologically (Figs. 1,2). There one such neuron in each hemiganglion of prothoracic ganglion. The medial dendrites int-1 overlap part terminal field formed by afferent axons from ear int-1's axon ascends to brain, terminating on same (ipsilateral) side (Fig- 2). 2. The has a two-part frequency response characteristic: (1) its spontaneous activity suppressed low frequencies (3 8 kHz) at threshold-to-moderate intensities (Fig. 9 B), (2) it strongly excited high frequencies, especially ultrasonic, 15–100 kHz 3). 3. Int-1 produces more spikes per tone pulse 4) reponse latency decreases 5), with increasing levels intensity when stimulated ultrasound. 4. Two-tone inhibition occurs int-1. When 30 (normally excitatory) combined 5 (which suppresses activity), combination results diminished response, compared excitatory alone 6). 5. The excitation shows lateralization. Excitation stronger ipsilateral sound source, than contralateral 9). 6. Int-1 responds electronically-generated trains that simulate bat-echolocation signals. responsive range ultrasonic are contained echolocation signals insectivorous bats 11). 7. In light characteristics, we speculate plays role detection emitted cricket's normal environment hunting bats.