The stealthy CP
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The document discusses simulations of internal delays in binaural hearing. It presents results from simulations where the cochlear delay (CD) and cochlear phase (CP) were varied and the resulting binaural delay (BD) was calculated. Measurements from animal studies on the distribution of CD and CP in the auditory nerve and inferior colliculus are also presented. The document examines the relationship between CD and CP in the auditory system and potential mechanisms that could give rise to internal delays.
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The stealthy CP
- 1. The stealthy CP Philip X. Joris Shotaro Karino Laboratory of Auditory Neurophysiology, K.U.Leuven, Leuven, Belgium Binaural Triangle, Aachen, october 2011
- 2. SIMULATION OF INTERNAL DELAY CD = 0 ms CP = 0 cycle ? BD = 0 ms
- 3. SIMULATION OF INTERNAL DELAY CD = 1 ms CP = 0 cycle ? BD = 1000 ms
- 4. SIMULATION OF INTERNAL DELAY CD = 0 ms CP = 0.2 cycle ? BD = 250 ms
- 5. SIMULATION OF INTERNAL DELAY CD = 0 ms CP = 0.5 cycle ? BD = +/- 650 ms
- 6. SIMULATION OF INTERNAL DELAY CD = 1 ms CP = -0.2 cycle ? BD = 750 ms
- 7. SIMULATION OF INTERNAL DELAY CD = 1 ms CP = 0.2 cycle ? BD = 1250 ms
- 8. SIMULATION OF INTERNAL DELAY CD = -0.2 ms CP = 0.3 cycle ? BD = 150 ms
- 10. BINAURAL RESPONSES CD = 270 ms CP = -0.19 cycle
- 11. BINAURAL RESPONSES CD = 640 ms CP = -0.10 cycle
- 12. BINAURAL RESPONSES CD = -60 ms CP = 0.44 cycle
- 13. CD – CP distribution in IC (measured with binaural beat) Guinea pig IC: inverse relationship between CD and CP (Mc Alpine et al., 1996)
- 14. ORIGIN OF INTERNAL DELAYS proposed mechanisms
- 15. “CD” – “CP” distribution in AN (measured with correlograms) Cat AN (1 animal, pairs with CFs within 0.1 oct.)
- 16. “CD” – “CP” distribution in AN (measured with correlograms) Cat AN (4 animals, pairs with CFs within 1/3 oct., unsigned)
- 17. CD – CP distribution in IC (measured with binaural beat) Cat IC
- 18. CD – CP distribution in AN and IC o AN + IC