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Hear cricket sounds12/27/2023 These studies also demonstrated that patterns of sound attenuation and degradation differ between habitats of birds or other vertebrates and that these physical constraints have implications for the evolution of animal vocalizations (for reviews see Wiley and Richards 1982 Michelsen and Larsen 1983 Embleton 1996). They used bird song to demonstrate how the structure and physical properties of the habitat affect excess attenuation, frequency filtering or the degradation of the species-specific amplitude modulation of sound signals. Studies on the impact of the transmission channel for sound signals have been pioneered by Morton (1975) and Wiley and Richards ( 1978, 1982). ![]() The consequences for the ability of field crickets to communicate acoustically close to the ground are discussed. Again, there was no simple directional gradient on the transmission channel rather, with decreasing distance to the source there were receiver locations providing suprathreshold responses, but no directional information. The directional information provided in the discharge differences of the two neurons also varied with distance. ![]() Although the AN1 activity generally decreased with increasing distance, large fluctuations in the magnitude of responses occurred with distance, indicating that the intensity gradient over distance is often irregular. The maximum hearing distance differed between individuals and weather conditions from 1 to 15 m (mean 9.2 m). The discharge and latency differences of the pair of neurons in response to conspecific chirps presented at different distances and directions were taken as a measure of directional information. We investigated directional hearing of crickets in the field using a neurophysiological approach, by recording the activity of the two prominent, bilaterally homologous AN1 neurons simultaneously in a cricket’s habitat. Many studies provide detailed behavioural and neurophysiological information on the ability of crickets to localize a sound source under ideal acoustic conditions, but very little is known about how they perform in real habitats.
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