November 1 - November 1 Wavelength determine color-Longer =...

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November 1 Wavelength determine color -Longer = red / shorter = violet Amplitude determines brightness Purity determines saturation Hearing What causes different types of deafness? Conduction deafness : poor transfer o sounds from tympanic membrane to inner ear. - compensate with amplifier (hearing aid) Nerve deafness : caused by damage to hair cells or auditory nerve - Hearing aids useless in these cases, since auditory messages cannot reach the brain - Cochlear implant: electronic device that stimulates auditory nerves, not very successful. Stimulation deafness : Damage caused by exposing hair cells to excessively loud sounds. - typical at rock concerts - By age 65 40% of hair cells are gone Sound waves: rhythmic movement of air molecules Pitch: higher or lower tone of a sound Loudness: sound intensity. How do we detect higher and lower sounds? Frequency theory : as pitch rises nerve impulses of the same frequency flow into the auditory nerve Place theory : Higher and lower tones excite specific areas of the cochlea Gustation
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