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Peripheral auditory processing in the bobtail lizard Tiliqua rugosa

III. Patterns of spontaneous and tone-evoked nerve-fibre activity

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Summary

  1. 1.

    70% of primary afferent fibres in the bobtail lizard were irregularly spontaneously active, with rates between 0.1 and 123.7 spikes/s (mean of 31.2 spikes/s). The rate distribution is bimodal. Mid-frequency fibres with lower thresholds tend to have higher spontaneous rates.

  2. 2.

    About one third of all fibres show a more prominent mode in their inter-spike interval histogram than is to be expected from a quasi-Poisson distribution. Preferred intervals in the spontaneous discharge patterns were not normally seen; this is presumably due to the lack of exclusive innervation of hair cells.

  3. 3.

    Primary fibres mostly responded to sound with a discharge rate increase. The form of the peri-stimulustime histogram varies between fibres; three different response types are described. Fibres of low characteristic frequency (CF up to 0.65 kHz) show a characteristic change in their response pattern with stimulation frequency; it is suggested that primary suppression plays an important role in shaping the very phasic response to tones at the fibres' upper frequency range. The responses of higher-CF fibres (CF 0.55–4 kHz) are independent of stimulation frequency. About one third of them shows a primary-like discharge pattern. The majority, however, responds with a chopper-like discharge pattern and there is evidence that this discharge, as in mammalian cochlear-nucleus stellate cells, originates from temporal summation.

  4. 4.

    The systematically-varying response pattern typical for low-CF fibres introduces special difficulties in defining the extent of the excitatory tuning curve and of the two-tone rate suppression area. The influence of threshold criteria on the overlap seen between both curves is discussed.

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Abbreviations

CF :

characteristic frequency

PSTH :

peri-stimulus time histogram

TIH :

time-interval histogram

TTRS :

two-tone rate suppression

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Authors and Affiliations

  1. Institut für Zoologie, Technische Universit↦ München, Lichtenbergstr. 4, D-8046, Garching, FRG

    Christine Köppl & Geoffrey A. Manley

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  1. Christine Köppl
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  2. Geoffrey A. Manley
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Köppl, C., Manley, G.A. Peripheral auditory processing in the bobtail lizard Tiliqua rugosa . J Comp Physiol A 167, 113–127 (1990). https://doi.org/10.1007/BF00192411

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