Summary
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1.
The mating (advertisement) calls of two sibling species of gray treefrogs,Hyla versicolor andHyla chrysoscelis, are spectrally identical but differ in trill rate; being higher forH. chrysoscelis. Single-unit recordings were made from the torus semicircularis of both species to investigate the neural mechanisms by which this species-specific temporal feature is analyzed. Using sinusoidally amplitude-modulated (AM) white noise as a stimulus, the temporal selectivity of these midbrain auditory neurons could be described by five response categories: ‘AM nonselective’ (34%); ‘AM high-pass’ (7%); ‘AM low-pass’ (6%); ‘AM band-suppression’ (12%); ‘AM tuned’ (40%).
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2.
The distributions of temporal tuning values (i.e., modulation rate at which each AM-tuned unit responds maximally) are broad; in both species, neurons were found which were tuned to modulation rates greater than those found in their advertisement calls. Nevertheless, the temporal tuning values forH. versicolor (median=25 Hz) were significantly lower than those forH. chrysoscelis (median=32.5 Hz).
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3.
The temporal selectivities of AM band-suppression neurons were found to be temperature dependent. The modulation rate at which a response minimum was observed shifted to higher values as the temperature was elevated. These results extend our earlier findings of temperature-dependent temporal selectivity in the gray treefrog.
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4.
The selectivity of band-suppression and AM-tuned neurons to various rates of amplitude modulation was largely, but not completely, indepndent of whether sinusoidal or natural forms of AM were used.
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Abbreviations
- AM :
-
amplitude modulated
References
Bibikov NG (1980) The reaction of the torus semicircularis units ofRana temporaria to the signals simulating the mating call temporal characteristics. Zool Zh 59:577–586
Bibikov NG, Gorodeckaja ON (1980) The reactions of neurons in the midbrain auditory center of the frog to amplitude modulated tones. Neirofiziologia 12:264–270
Brenowitz EA, Rose GJ, Capranica RR (1985) Neural correlates of temperature coupling in the vocal communication system of the treefrog (Hyla versicolor). Brain Res (in press)
Capranica RR, Rose G (1983) Frequency and temporal processing in the auditory system of anurans. In: Neuroethology and behavioral physiology. Huber F, Markl H (eds) Springer, Berlin Heidelberg New York Tokyo, pp 136–152
Fellers G (1979) Aggression, territoriality, and mating behavior in North American treefrogs. Anim Behav 27:107–119
Gerhardt HC (1974) Mating call differences between eastern and western populations of the treefrog,Hyla chrysoscelis. Copeia 1974:534–536
Gerhardt HC (1978) Temperature coupling in the vocal communication system of the gray tree frog,Hyla versicolor. Science 199:992–994
Gerhardt HC (1982) Sound pattern recognition in some North American treefrogs (Anura: Hylidae): Implications for mate choice. Am Zool 22:581–595
Harnischfeger G (1979) An improved method for extracellular marking of electrode tip positions in nervous tissue. J Neurosci Methods 1:195–200
Hoy RR (1974) Genetic control of acoustic behavior in crickets. Am Zool 14:1067–1080
Johnson C (1960) Species recognition in theHyla versicolor complex. Texas J Sci 18:361–364
Mayr E (1963) Animal species and evolution. Harvard University Press, Cambridge
Ralin B (1976) Comparative hybridization of a diploid-tetraploid cryptic species pair of tree frogs. Copeia 1976:191–195
Rose G, Capranica RR (1981) Selectivity of single units in the central auditory system of the leopard frog (Rana pipiens) to AM signals. J Acoustic Soc AM Abst 009:PS95
Rose G, Capranica RR (1983) Temporal selectivity in the central auditory system of the leopard frogRana pipiens. Science 219:1087–1089
Rose G, Capranica RR (1984) Processing amplitude modulated sounds by the auditory midbrain of two species of toads: Matched temporal filters. J Comp Physiol A 154:211–219
Rose G, Capranica RR (1985) Sensitivity to amplitude modulated sounds in the anuran auditory nervous system. J Neurophysiol 53:446–465
Schildberger K (1984) Temporal selectivity of identified neurons in the cricket brain. J Comp Physiol A 155:171–185
Walkowiak W (1980) The coding of auditory signals in the torus semicircularis of the fire-bellied toad and the grass frog: responses to simple stimuli and to conspecific calls. J Comp Physiol 138:131–148
Walkowiak W (1984) Neuronal correlates of the recognition of pulsed sound signals in the grass frog. J Comp Physiol A 155:57–66
Wasserman AO (1970) Polyploidy in the common tree toadHyla versicolor Le Conte. Science 67:385–386
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Rose, G.J., Brenowitz, E.A. & Capranica, R.R. Species specificity and temperature dependency of temporal processing by the auditory midbrain of two species of treefrogs. J. Comp. Physiol. 157, 763–769 (1985). https://doi.org/10.1007/BF01350073
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DOI: https://doi.org/10.1007/BF01350073