ISSN:
1432-1351
Keywords:
Lizard
;
Hearing
;
Auditory nerve
;
Phase locking
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary 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. 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. 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. 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00192412
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