NEUR3112 Lecture Notes - Lecture 24: Sound, Azimuth, Action Potential
Document Summary
The difference between the sound perceived by each ear. Near ear heads the sound fractionally before the far ear -> timing difference. Sound in near ear is larger in volume -> volume difference. Not just a smaller version in the far ear, the waves are different. Speed of sound in air = ~340 m/s distance from one ear round to other ear = ~ 20 cm. Maximum time difference for sound to reach different ears = ~ 0. 6 ms (less for sound closer to the middle. Neurons must be able to detect remarkably small timing difference (maybe as low as 10 s differences) (c. f. These are thought to be in the superior olivary complex. Jeffress model -> the delay will cause a different neuron to become activated -> sound arrives at one specific nerve at the same time, this is what activates it. Speed of ap up to 100 m/s 0. 6 ms difference = 60 mm path length!
