Barn Owl Sound Localization

To quantify how this frequency dependence may be related to the asymmetrically arranged ear openings Payne measured the. While the matching models can explain properties of neural responses nomodel explains how the owl resolves spatial ambiguity in the localization cues toproduce accurate localization for sources near the center of gaze.

Not Just A Pretty Face The Facial Ruff Of Barn Owls And Sound Localisation Barn Owl Barn Owl Sounds Owl

Barn owls Tyto alba can use sound to catch prey in total darkness.

Barn owl sound localization. Continuous pure tones of frequencies below 6 kHz and above 9 kHz were hard to localize. Barn owls can localize a sound source using either the map of auditory space contained in the optic tectum or the auditory forebrain. The auditory thalamus nucleus ovoidalis NOv is situated between these two auditory areas and its inactivation precludes the use of the auditory forebrain for sound localization.

The auditory thalamus nucleus ovoidalis NOv is situated between these two auditory areas and its inactivation precludes the use of the auditory forebrain for sound localization. For our study we used the barn owl Tyto alba. Head orientation and movement were measured using an adaptation of the search coil technique which provided continuous high resolution azimuthal and elevational information during the behavior.

Here I exam-ine two models for the barn owls sound localization. The barn owl is a nocturnal predator with excellent sound localization ability. Interaural time differences are differences in the intensity between the ears.

Methods Details of the behavioral paradigm measurement techniques and. Sound localization by barn owls is commonly modeled as a matching procedurewhere localization cues derived from auditory inputs are compared to stored tem-plates. We investigated the mechanisms by which the barn owl Tyto alba determines the azimuth and elevation of a sound source.

These experiments no impairment in sound localization was observed when the stimulus was as short as 75ms Knudsen and Konishi 1979 supporting the notion that barn owls may use an open-loop strategy for sound localization. This article reviews the morphological and functional organization as well as the role of the. Sound frequencies above 5 kHz seemed to be most important.

Two barn owls were trained to strike protected loudspeakers emitting various artificial sounds. The experiments described so far did not reveal which sound parameters the barn owl uses for sound localization. The barn owl is a well-known model system for studying auditory processing and sound localization.

We examined sound localization in the barn owl under conditions that evoke the PE in humans. Head turns were always directed at the leading source and were nearly as precise as turns toward single sources. Based on the owls performance in localiz- ing tonal targets and on the effects of perturbing the peripheral auditory apparatus we conclude that the barn owl uses both A T and AS to localize sounds.

Due to the asymmetric ears of this bird the interaural time and level differences respectively provide information. Due to the asymmetric ears of this bird the interaural time and level differences respectively provide information for the horizontal and vertical direction of a sound source. This article reviews the morphological and functional organization as well as the role of the underlying microcircuits of the barn owls inferior colliculus IC.

A small bias in the direction of the lagging sound was evident when the initial gaze direction was close to the lagging source. The barn owl is a well-known model system for studying auditory processing and sound localization. The barn owl is a nocturnal predator with excellent sound localization ability.

Payne specifically tested the influence of frequency on localization behaviour. These differences are the principal cues for locating sound elevation. Open loop refers to experimental conditions in which the reaction time here the latency until the head turn starts exceeds the stimulus duration which.

The barn owl is a nocturnal predator with excellent sound localization ability. Due to its asymmetric ears the interaural time and level differences provide information for the horizontal and vertical direction of a sound source. Barn owls can localize a sound source using either the map of auditory space contained in the optic tectum or the auditory forebrain.

The dynamics and accuracy of sound localization by the barn owl Tyto alba were studied by exploiting the natural head-orienting response of the owl to novel sound stimuli. The barn owl is a nocturnal predator with excellent sound localization ability. Bi-coordinate sound localization by the barn owl Andrew Moiseff Department of Physiology and Neurobiology University of Connecticut Storrs Connecticut 06269-3042 USA Accepted September 15 1988 Summary.

The influence of experience on sound localization has been examined previously in various species including man with contradictory results 19. Our measure of localizing ability was the accuracy with which the owl oriented its head to a sound source. Binaurally time-shifted and intensity- unbalanced noise delivered through earphones in- duced owls to respond with a head-orienting be- havior similar to that which occurs to free.

The azimuthal component of these errors was frequency. When localizing tonal signals the owl committed the smallest errors at frequencies between 4 and 8 kHz. Due to the asymmetric ears of this bird the interaural time and level differences respectively provide information for the horizontal and vertical direction of a sound source.

Various binaural cues to sound localization by the barn owl. For 3- and 5-ms delays localization dominance was very strong. The accuracy of localization depended on the frequency bandwidth and temporal pattern of the test sound.

Forty years of behavioral anatomical and physiological research on the owls auditory system have revealed that these two acoustic.

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