L26_Sensory%20Motor%20Integration

L26_Sensory%20Motor%20Integration - Encoding SOUND Loudness...

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1 26. SENSORY-MOTOR INTEGRATION CD HOPKINS March 26, 2008 2 BioNB222 Encoding SOUND Loudness Pitch 3 BioNB222 Encoding loudness by spike rate 4 BioNB222 Encoding pitch by place code “labeled line” for frequency 5 BioNB222 Also by spike timing TIME Æ “raster” 6 BioNB222 Also by spike timing TIME Æ “raster”
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2 7 BioNB222 8 BioNB222 Auditory pathways dorsal view mammalian brain 9 BioNB222 medial geniculate auditory cortex inferior colliculus superior olive complex cochlear nucleus 10 BioNB222 Cochlear Nuclei superior olivary complex C.N. Auditory afferents split to terminate in different Cochlear Nuclei (parallel processing) Input from the cochlea VIII th nerve. Cajal, 1909 cochlear nuclei 12 BioNB222 CN cell types & responses
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3 13 BioNB222 Spherical bushy cells 14 BioNB222 15 BioNB222 Large calyx synapses ensure 1:1 firing Synapses on soma preserve accuracy of spike times. Multiple inputs reduces “jitter”. 16 BioNB222 Terminals on distal dendrites allows for spatial summation. Good for amplitude encoding. 17 BioNB222 Sound Localization 18 BioNB222 What Physical Cues for Location? Inter-aural Time Difference (ITD) Inter-aural Intensity Difference (IID)
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4 19 BioNB222 ITD v d ITD ) sin( θ = Human: 440 • sin ( θ ) [microseconds] 20 BioNB222 IID Best for high frequency 21 BioNB222 Creating a map 22 BioNB222 Delay-line-coincidence-detector in MSO makes a map of ITD. Predicted by L. Jeffress 1948.
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