Power density spectra of the fluctuations in sound energy are presented in stridulations emitted by Pterophylla Camellifolia. The original emplitude recording, used for the computation of power spectra, reveals a characteristic temporal pause-stridulation-pause pattern possibly related to the insect's available metabolic energy.
It is suggested that power spectra be used not only for insect identification and philogenetic characterization, but also to define normal as well as pathological speech patterns including the tracing of possible genetic involvement of speech defects by analysis of the speech of siblings and parents of probands.
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References
1.
Blackman, R. B. and Tukey, J. W. (1958). The Measurement of Power Spectra (New York).
2.
Fischer, R. and England, S. J. M. (1963). Power spectra of rhythms in the mating song of the North American Katydid (Pterophylla Camellifolia) and in selected readings from English literature. Paper presented at 8th Int. Conf. Soc. Biol. Rhythms, Hamburg, Sept. 9–11.
3.
Florkin, M. and Mason, H. S. (1960). Comparative Biochemistry: a Comprehensive Treatise, Vol. II (New York and London).
4.
Frings, H. and Frings, M. (1962). Effects of temperature on the ordinary song of the common grasshopper, Orchelimum vulgare (Orthoptera: Tettigoniidae). J. exp. Zool., 151, 33.
5.
Haskell, P. T. (1961). Insect Sounds (London).
6.
Kirsten, E., Kirsten, R. and Arese, P. (1963). Das Verhalten von freien Aminosäuren, energiereichen Phosphorsäure-Verbindungen und einigen Glykolyse– und Tricarbon-säurecyclus-Substraten in Muskeln von Locusta migratoria bei der Arbeit. Biochem. Zeitschr., 337, 167.
7.
Mercer, D. M. A. (1960). Analytical methods for the study of periodic phenomena obscured by random fluctuations. Cold Spring Harbor Symposia on Quantit. Biol., 25, 73.
8.
Spangler, R. A. and Snell, F. M. (1961). Sustained oscillations in a catalytic chemical system. Nature, 191, 457.
9.
Wigglesworth, V. B. (1950). The Principles of Insect Physiology (London).
