Summary
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1.
Primary auditory fibres in the bobtail lizard phase-lock up to a maximal frequency of 1.0 to 1.3 kHz at 30 °C body temperature.
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2.
Phase histograms frequently have two peaks, 180° apart. The frequency of occurrence of this phenomenon in low- and high-CF fibre populations is related to the different tendencies of fibres to innervate both hair-cells' polarities.
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3.
The vector strength of the phase histograms falls more rapidly with increasing frequency in fibres of a high-CF group than in those of the low-CF group. The corner frequency of the low-CF group is 0.73 kHz, that of the high-CF group 0.51 kHz (at 30 °C). It is suggested that the membrane time constants of high-CF fibres are longer than those of low-CF fibres.
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4.
The phase delays of the fibres' phase responses below CF vary with CF, from near 3 ms for high-CF cells to 6 ms for low-CF cells. As a travelling wave is not present, these delays must be mainly due to the response times of the hair-cell filters.
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Abbreviations
- CF :
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characteristic frequency
- PSTH :
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peri-stimulus time histogram
- VS :
-
vector strength
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Manley, G.A., Yates, G.K., Köppl, C. et al. Peripheral auditory processing in the bobtail lizard Tiliqua rugosa . J Comp Physiol A 167, 129–138 (1990). https://doi.org/10.1007/BF00192412
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DOI: https://doi.org/10.1007/BF00192412