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04_Sound Localization Questions

04_Sound Localization Questions - MCB!167...

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MCB 167 Discussion assignment for Friday, Feb 26 Axonal Delay Lines for ITD Calculation Reading : Seidl AH, Rubel EW, Harris DM. Mechanisms for adjusting interaural time differences to achieve binaural coincidence detection. Journal of Neuroscience 30(1): 70 " 80, 2010. Reading guide. This paper investigates how axonal delay lines are constructed for ITD calculation in the chick nucleus magnocellularis (NM) and n. laminaris (NL). Chick NL receives convergent excitatory input from the contralateral and ipsilatereal magnocellular nuclei (NM). NM axons form delay lines, and NL neurons act as coincidence detectors, as in the owl. For ITD calculation to work, the conduction delay of contralateral NM axons should be ~ 0 to 180 ! sec longer than the conduction delay of ipsilateral NM axons. This would allow ITDs up to 180 ! sec to be calculated, which is the physiological range of ITD for the chicken. This paper evaluates how delay lines are built. Are they simply longer axons, which is the standard model? If so, which branches provide the increasing delay line? Does the extra axon length predict 180
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