Summary
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1.
The responses of single acoustic neurons to sound stimuli were recorded by capillary microelectrodes at three sequential stations (the receptors, the ventral cord, and the supraesophageal ganglion) of the auditory pathway of the tettigoniid speciesDecticus verrucivorus.
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2.
To characterize the responses to sound stimuli varying in intensity, frequency, direction, and duration, the following four basic measures were used: response fields (threshold and constant-response curves vs. frequency), intensity characteristics, directional diagrams, and the time course of the neuronal discharge. These measures are employed to compare both neurons at each station and those at different levels, so that the progressive development of neuronal information processing can be followed from the receptors to the brain.
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3.
At the receptor level two groups of neurons can be distinguished; on the basis of general morphological comparisons their origins are ascribed to the crista acustica (group a) and the intermediate organ (group b) (Fig. 2).
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4.
Receptor cells of group a differ among themselves in characteristic frequency and threshold. Bach carries out a precise coding of intensity and direction in its nearthreshold region (Figs. 1, 3, 5 and 6), but with stimuli more than about 30 dB above threshold, the response saturates. The response areas of different cells overlap so that, taken as a whole, they ensure relatively precise transduction of the above-mentioned stimulus parameters over a wide range of frequencies and intensities.
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5.
Group-b receptor cells (intermediate organ) are considerably less sensitive to changes in stimulus frequency, intensity, and direction (Figs. 2 and 10). Like those of group a they respond nearly tonically to stimuli sufficiently above threshold (Figs. 7 and 11), though with long stimuli a slight initial phasic component is discernible (Fig. 8).
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6.
The neurons of the ventral cord receive synaptic input from several tympanic units of the same side, and in many cases informations of the opposite side as well. The observed unilateral and bilateral effects can be brought about by facilitation and inhibition. As a result of this complex integration the discrimination of certain sound parameters available in the receptor-cell responses can, at the ventral-cord level, either be enhanced considerably or be degraded.
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7.
Whereas frequency selectivity at the higher levels is severely degraded in comparison with that available at the receptor level (Figs. 13, 14, 15 and 29), the precision of intensity and direction coding is distinctly enhanced (Figs. 17, 18, 30 and 31). The response patterns recorded inchide those of phasic units, tonic units, and intermediate forms, as well as units which alter the pattern with stimulus conditions. Several of these are well matched to specific features of the stridulation sounds of the species (Figs. 20 and 21).
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8.
As far as the processing of frequency and intensity is concerned, only quantitative differences—no fundamental or qualitative differences—were observed in comparisons of the ventral cord and the supraesophageal ganglion (Figs. 24 and 26). With respect to the coding of direction and form of the response pattern, however, characteristic novel units are found in the supraesophageal ganglion (Figs. 25, 27, 28 and 33). Finally, the extent to which “recognition filters” exist at the level of the ventral cord and the supraesophageal ganglion is discussed in terms of the known aspects of acoustic behavior.
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Supported by Deutsche Forschungsgemeinschaft, grants to J. Schwartzkopff and SFB 114.
I gratefully acknowledge the assistance of Dr. K. Kalmring and the helpful criticism of Prof. Dr. J. Schwartzkopff. I thank Dr. H.-J. Leppelsack for making the computer program available to me. Dr. M. A. Biederman-Thorson was so kind as to translate the German manuscript and Mrs. Ch. Klotz to type it.
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Rheinlaender, J. Transmission of acoustic information at three neuronal levels in the auditory system ofDecticus verrucivorus (Tettigoniidae, Orthoptera). J. Comp. Physiol. 97, 1–53 (1975). https://doi.org/10.1007/BF00635647
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DOI: https://doi.org/10.1007/BF00635647