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Sound localization in the owl:representation and control
Brain MechanismsStudent’s Choice Topics
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Why the Owl• Aural predator –
hunt’s with sound localization
• Phase locking ability -- upwards of 10 kHz
• Strong dependence on ITD cues over wide frequency range
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ITD CodingOptimal coding
Vs. Jeffress coincidence
detection
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Discussion topics• ITD coding in the Inferior
Colliculus– Limitations of current models– “physiologically relevant”
range– Pi limit
Distribution of interaural time difference in the barn owl’s inferior colliculus in low- and high-frequency ranges
Wagner et al., 2007
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• Preservation of spectrotemporal tuning between the nucleus laminairis and the inferior colliculus of the barn owl
– Christianson and Pena, 2007
Topics
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Topics• Top-down gain control of the auditory space map by
gaze control circuitry in the barn owl– Winkowski and Knudsen, 2006