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IHC and OHC Afferent innervation pattern

עבוד אותות במערכת החושים סמסטר א' תשס"ח הרצאה מס' 5 http://www.eng.tau.ac.il/~mira/Senses2008 Neural Activity. IHC and OHC Afferent innervation pattern. IHC E fferent Innervation. Lateral olivary complex fiber s synapse on type I afferents coming from IHC.

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IHC and OHC Afferent innervation pattern

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  1. עבוד אותות במערכת החושיםסמסטר א' תשס"חהרצאה מס' 5http://www.eng.tau.ac.il/~mira/Senses2008Neural Activity

  2. IHC and OHC Afferent innervation pattern

  3. IHCEfferent Innervation Lateral olivary complex fibers synapse on type I afferents coming from IHC Afferent fibers synapse with brain stem at the cochlear nuclei

  4. Sound encoding by acoustic neuron

  5. Action Potentials

  6. Neural Activity:

  7. SpontaneousNeural Activity (1) Stationary

  8. SpontaneousNeural Activity (2) Correlation

  9. SpontaneousNeural Activity (3)

  10. SpontaneousNeural Activity (4) The spontaneous neural activity can be described as: • A stationary, renewal process. • The length of successive intervals are statistically independent. Thus • The probability density function of interval length describes the process

  11. SpontaneousNeural Activity (5) • - Interval length n – number of spikes in the interval T

  12. Spontaneous Rate

  13. Spontaneous Rate

  14. Neural Activity:Response to Click

  15. Neural Activity:Response to Click

  16. Neural Activity:Response to a Tone

  17. Tuning Curves

  18. Tuning Curves

  19. Neural Response as a function of Level

  20. Input-Output Function of a Single Auditory Nerve Fiber This figure shows the input-output function of a single fiber. Notice that the firing rate of the neuron increases as the stimulus intensity increases within its dynamic range, and eventually plateaus.

  21. threshold saturation Auditory nerve rate-intensity functions In general, the auditory nerve fibers that have higher levels of spontaneous activity (HSR), have lower thresholds and lower saturation points. The fibers that have lower levels of spontaneous acitivity (LSR), have higher thresholds and higher saturation points

  22. Neural Activity:Response to Speech

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