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Unformatted text preview: Ears and Hearing * Waves are characterized by frequency and intensity. * Frequency: * Measured in hertz (cycles per second). * Greater the frequency the higher the pitch. * Intensity: * Directly related to amplitude of sound waves. * Measured in decibels. Outer Ear * The shape of the outer ear (auricle) increases the intensity of the intermediate frequencies: those that are most important for preception of speech sounds * Sound waves are funneled by the auricle into the external auditory meatus. * External auditory meatus channels sound waves to the tympanic membrane. * Increases sound wave intensity. Anatomy of the Ear Middle Ear Bones * The ossicles (the smallest bones in the bondy) amplify the sound 20 X due to leverage * advantage: sensitivity to soft sounds *-disadvantage; possible damage to sensory cells from loud sounds...
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