1. עבוד אותות במערכת החושים סמסטר א' תשס"ח הרצאה מס' 5 http://www.eng.tau.ac.il/~mira/Senses2008 Neural Activity http://www.eng.tau.ac.il/~mira/Senses2008

2. IHC and OHC Afferent innervation pattern

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

5. Action Potentials

6. Neural Activity:

7. Spontaneous Neural Activity (1) Stationary

8. Spontaneous Neural Activity (2) Correlation

9. Spontaneous Neural Activity (3)

10. Spontaneous Neural 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. Spontaneous Neural Activity (5)  - Interval length n – number of spikes in the interval T

12. Spontaneous Rate

14. Neural Activity: Response to Click

16. Neural Activity: Response to a Tone

17. Tuning Curves

19. Neural Response as a function of Level

20. 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. Input-Output Function of a Single Auditory Nerve Fiber

21. 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 threshold saturation Auditory nerve rate-intensity functions

22. Neural Activity: Response to Speech