review of feb 25 - Identifying what and where sounds come...

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Identifying what and where sounds come from What: specificity (specific to that sound Invariance (sound constancy, what is shared by many sounds) Sound -changes in air pressure propagating across the room. Some are periodic The number of compressed and rarefied air patches that pass by a given point per second is frequency. This determines pitch . Slow-low, fast-high. Cycle - time between successive compressed air patches Hertz -cycles per second Amplitude – the difference between pressure between the compressed and rarified patches of air. Large difference or small difference. Large or low compression. The size of the difference, the amplitude, determines the volume. More compression-louder. Audition is “non-veridical ”: not simply stimulus-driven, but also knowledge-driven Illusions…kinda like closure? Gestalt grouping principles Proximity : Our brain likes to impose structure on the stimulus, sometimes we get illusions, etc. Example is a bunch of sound points, ½ sound the same, other half sounds the same, so instead of hearing one sound going up and down cyclically, our brain processes two distinct sounds. This depends on the time frame between the sounds though. Closer the
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This note was uploaded on 05/28/2009 for the course COG 050.203.01 taught by Professor Dr.rapp during the Spring '09 term at Johns Hopkins.

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review of feb 25 - Identifying what and where sounds come...

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