PSYC1101 Lecture Notes - Lecture 6: Umami, Monocular Vision, Morphine
Document Summary
Sound: pressure waves in air, water or some other medium. Frequency: the number of sound waves, or cycles, per second. 1 hz = 1 cycle/second: humans hear 20 to 20 000 hz. The higher the frequency, the higher the pitch. Amplitude: the vertical size of the sound waves. The amount of compression and expansion of the molecules in the conducting medium. Decibels (db): a measure of the physical pressures that occur at the eardrum. Loudness is not absolute as your body adapts to a level of hearing. Auditory transduction: from pressure waved to nerve impulses: auditory system transforms wave amplitude and frequency into nerve impulses. Sound waves push against the eardrums: relayed from ear drum to the ossicles (hammer, anvil, stirrup, ossicles amplify sound. The movement of fluid in the cochlear bends hair cells in the organ of corti: triggers the neuronal signal.
