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181.
T. N. Kenyon 《Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology》1996,179(4):553-561
Psychophysical experiments demonstrated that the hearing abilities of two damselfish species change during ontogeny. Auditory thresholds of four size-groups of juvenile bicolor damselfish. Pomacentrus partitus, and for comparative purposes, three different sized juveniles belonging to a closely related species, P. variablis, were determined through classical conditioning experiments conducted in a standing wave tube. Young juveniles (10–27 days post-metamorphosis) exhibited poor hearing, with detection limens ranging from 54 dB (at 300 Hz) to 15 dB (at 1500 Hz) higher than known adult thresholds. Thresholds decreased exponentially with increasing age, while rapidly approaching adult levels. Youngest juveniles exhibited flat, untuned audiograms, with the appearance of a best frequency and a pattern of increasing acuity progressing in a manner similar to that observed in mammals and birds. 相似文献
182.
R. C. Roverud 《Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology》1999,185(3):247-253
In a two-alternative, forced-choice task lesser bulldog bats were trained to distinguish between a pure tone pulse and a
pulse composed of a series of brief tonal steps oscillating between two different frequencies. The tone-step pulse gradually
approximates the pure tone pulse as the frequency difference between the steps becomes progressively smaller. Frequency difference
limens for the brief tonal frequency steps were determined for a broad range of ultrasonic frequencies. The variation in tone-step
difference limens with frequency appears to be correlated to the frequency structure of the bat's short-constant-frequency/frequency-modulated
echolocation sound. There was a marked decline in the value of the relative frequency difference limens (Weber ratio) over
a fairly narrow range of frequencies above the constant frequency and a sharp increase in threshold above this range. The
relative thresholds for frequency discrimination were small and uniform over the frequency range of the frequency-modulated
sweep and increased for frequencies below the frequency- modulated sweep. Thus, the most accurate frequency-discrimination
abilities occur over a narrow frequency range around the frequency of the constant-frequency component of returning echoes.
Frequency discrimination over the range of frequencies of the frequency-modulated component is relatively good.
Accepted: 20 March 1999 相似文献