Effect of Decorrelation of Binaural Sound on Barn Owl's Ability to Detect Change in Interaural Time Difference Under a Bayesian Processing Model
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Date
2016-03
Authors
Worth, Alexander
Journal Title
Journal ISSN
Volume Title
Publisher
University of Oregon
Abstract
Barn Owls (Tyto alba) have an exceptional ability to spatially localize sounds in
their environment. Barn owls are able to localize prey using hearing alone (Konishi,
1973). By processing the interaural time and level differences of incoming sound
stimuli, owls are able to place sounds in a neural space map. The neural pathway for
processing interaural time difference (ITD) is well documented in the literature (Carr &
Konishi, 1988; Carr & Konishi, 1990; Wagner, Takahashi, & Konishi, 1987). Recent
literature has suggested that the classical place coded model for barn owl sound
localization is ineffective in predicting behavior, and a Bayesian model for localization
is a more accurate representation neural and behavioral results. (Fischer & Pena, 2011 ).
Our research aims to show how owls' ability to detect an ITO is altered by varying
levels of binaural correlation of incoming sounds. I hypothesized that decorrelation of
binaural sound stimuli would lead to owls' decreased accuracy of detecting an interaural
time difference. Results have shown owls' ability to accurately detect a change in ITD
of 8μs at 100 percent binaural correlation. Our data also shows that owls are able to
detect 8 microsecond changes in ITO at binaural correlation values as low as 60%,
leading us to believe that the birds can maintain high behavioral accuracy with low
levels of binaural correlation. Future research will require more experiments to build a
data set with less variance and to develop a complete model of owls' ITO detection
capabilities given a broader range of binaural decorrelation values.
Description
37 pages. A thesis presented to the Department of Biology and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Science, Spring 2016.
Keywords
Biology, Sensory processing, Neurosciences, Owls, Sound localization, Interaural time difference, Sensory processing, Bayesian