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- W2319970620 abstract "From dusk until midnight, nearly every day of the year, a deafening din floods Puerto Rico's rain forests. Every few seconds, male Eleutherodactylus coqui frogs trumpet their co-qui mating call in competition with the blaring advertisements of seven other frog species and the dissonant chorus of rasping, chirping, buzzing insects. The animal orchestra creates such a loud cacophony that researchers working in the forest say they have a hard time hearing themselves think. Yet the male and female coqui frogs and their amphibian compatriots somehow sort through the pandemonium, separating the melodious acoustic wheat of their own species from the chaotic chaff of other creatures' chants. Exactly how the coqui and other frogs discriminate sounds in such noisy environments has long fascinated neuroethologist M. Narins at the University of California at Los Angeles (UCLA). He and others have found that amphibians employ a variety of communication strategies, including divvying up sound frequencies among different species, creating a louder fracas than their neighbors or producing periodic, easily recognizable calls. Most recently Narins and two associates have discovered that coqui frogs in particular may also be aided in pinpointing a sound's direction with an unusual sound pathway: through the lungs. They reported in the March PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES (Vol. 85, No.5) that when a sound wave hits a frog's side, it can travel through the airfilled lungs, up through the voice box, into the eustachian tubes and on to the eardrum. Peter and his colleagues have found what may be a totally unexpected medium for processing sound in these species of frogs, says Steven Greenberg, an auditory neurophysiologist at the University of Wisconsin in Madison. makes us rethink the ways in which sounds are localized in space, at least by frogs. This and findings in other animals are adding some interesting twists to the study of the evolution of hearing in vertebrates. Humans and most other mammals can tell a sound's direction by comparing the vibrations the sound waves induce in each eardrum. The waves entering the ear nearest the source are more intense and arrive sooner than do those entering the far ear. But to exploit this intensity and timing difference, the sound's wavelength must be much smaller than the distance between the ears. Since the upper audible limit of most mammals falls within 20,000 to 60,000 hertz, this condition is usually met in even the smallest mammals." @default.
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- W2319970620 date "1988-05-14" @default.
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- W2319970620 title "The Body Ear" @default.
- W2319970620 doi "https://doi.org/10.2307/3972398" @default.
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