Journal ArticleDOI
Amplitude modulation thresholds for the parakeet (Melopsittacus undulatus)
TLDR
Parakeets were tested for the ability to detect sinusoidal amplitude modulation of broad band noise and results are somewhat different from amplitude modulation functions in humans suggesting different degrees of temporal resolving power in birds and humans.Abstract:
Parakeets were tested for the ability to detect sinusoidal amplitude modulation of broad band noise. Instrumental avoidance conditioning and a psychophysical modified method of limits procedure were used to measure the threshold for detecting amplitude modulation at 10 modulation frequencies between 2 and 2,048 Hz. Below about 40 Hz, modulation threshold is independent of modulation rate and noise level. Above 40 Hz, modulation threshold decreases with modulation frequency at the rate of 3 dB/ octave. These results are somewhat different from amplitude modulation functions in humans suggesting different degrees of temporal resolving power in birds and humans. Thresholds for changes in modulation rate are 1–2 orders of magnitude higher than pure tone frequency difference limens.read more
Citations
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Journal ArticleDOI
Periodicity coding in the auditory system.
TL;DR: The present review summarizes the present knowledge about representation and processing of periodic signals, from the cochlea to the cortex in mammals, and in homologous or analogous anatomical structures as far as these exist and have been investigated in other animals.
Book ChapterDOI
Hearing in Birds and Reptiles
TL;DR: Any comparison of hearing between reptiles and birds is somewhat unbalanced because it also involves a comparison across methodologies: hearing estimates from anatomical and physiological data in the case of reptiles along with behavioral estimates of hearing capabilities in birds.
Journal ArticleDOI
Cocktail–party effect in king penguin colonies
Thierry Aubin,Pierre Jouventin +1 more
TL;DR: Chicks can discriminate between the parental call and calls from other adults at a greater distance, even when call intensity is well below that of the noise of simultaneous calls produced by other adults, which enhances the chick's ability to find its parents.
Journal ArticleDOI
Feature extraction and tonotopic organization in the avian auditory forebrain
C. M. Müller,H. J. Leppelsack +1 more
TL;DR: A neurophysiological study within the auditory centers of the mediocaudal telencephalon of the starling, 601 neurons were tested for auditory responses and results are discussed in terms of possible mechanisms of feature extraction in the avian auditory system.
References
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Journal ArticleDOI
Temporal modulation transfer functions based upon modulation thresholds
TL;DR: Although the TMTFs are not directly consistent with the attenuation characteristic of a simple lowpass filter, a model which incorporates such a filter, with a time constant of 2.5 ms, describes the entire TMTF and also describes the modulation functions obtained with square-wave and pulse modulation.
Journal ArticleDOI
Frequency discrimination as a function of frequency and sensation level
TL;DR: Frequency discrimination was measured and sensation level was measured using pulsed sinusoids as stimuli in an adaptive two‐interval force‐choice psychophysical procedure to evaluate the predictions of current theoretical models.
Book
Hearing and Sound Communication in Fishes
TL;DR: A compilation of the papers presented at a meeting that took place in April 1980 at the Mote Marine Laboratory, Sarasota, Florida is presented in this article, which is an outgrowths of two earlier international meetings on marine bio-acoustics that occurred in 1963 and 1966 (Tavolga 1964, 1967).
Journal ArticleDOI
Intensity discrimination as a function of frequency and sensation level
TL;DR: An analysis of the actual values of ΔI/I reported in the other studies indicates a range larger than would be predicted on the basis of individual differences among observers in this study.