sound localization in the owl: representation and control
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Sound localization in the owl:representation and control
Brain MechanismsStudent’s Choice Topics
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
ITD CodingOptimal coding
Vs. Jeffress coincidence
detection
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
• Preservation of spectrotemporal tuning between the nucleus laminairis and the inferior colliculus of the barn owl
– Christianson and Pena, 2007
Topics
Topics• Top-down gain control of the auditory space map by
gaze control circuitry in the barn owl– Winkowski and Knudsen, 2006
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