Unformatted text preview: Audition Audition Questions to answer this lecture Questions to answer this lecture What is the nature of the stimulus that the brain perceives as sound? How does the nervous system transduce changes in air pressure into our impression of sounds? How does auditory system analyze sound waves? What pathway does info travel from the auditory receptors to the neural cortex How does the brain understand language and If a tree falls in the woods and no I f a tree falls in the woods and no one is around to hear it, does it make a sound? The Stimulus for Audition The Stimulus for Audition
Sound movement of air molecules from a source of vibration Sound waves energy generated by this displacement of molecules causes waves of changing air pressure Travel at a fixed speed of 1100 feet per second Physical Properties of Sound Waves Physical Properties of Sound Waves
Frequency (pitch) # of cycles a wave completes in a given amt of time cycles/sec (Hz) Amplitude (loudness) the intensity of sound, measured in dB Complexity (timbre) mixture of frequencies, can be simple or complex, difference in sound btw a violin and trumpet Anatomy of the auditory system Anatomy of the auditory system Outer Ear (The pinna) Sound arrives outer ear Catches sound waves Outer ear funnels in sound to eardrum Made of cartilage and flesh Eardrum Eardrum Vibrates when sound waves hit Miniature drum Tympanic Membrane Middle Ear Middle Ear Vibrating eardrum causes ossicles to vibrate 3 bones Mal...
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- Spring '10
- hair cells, auditory receptors, Basilar Membrane Basilar Membrane