Module 14 - 20:49 Objective 14-1 We hear sounds with...

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20:49 Objective 14-1 We hear sounds with certain frequencies in the range corresponding to human voice the best We easily detect differences among thousands of human voices o Recognize friend’s voices over the phone Sound waves are made up of jostling molecules of air, bumping into each other The resulting waves of compressed and expanded air are like ripples in a pond…our ears can detect brief air pressure changes We can also feel the vibrations o Ears transform the vibrating air into nerve impulses, which our brain decodes as sounds o The strength, or amplitude, of sound waves determines their LOUDNESS o Frequency determines PITCH o Long waves have low frequency and low pitch o Short waves have high frequency and high pitch Sound is measured in decibels…every 10 decibels correspond to a tenfold increase in sound Objective 14-2 Converting sound waves into neural activity so we can hear o The visible outer ear channels the sound waves through the auditory canal to the eardrum (a tight membrane that vibrates with the waves) o The middle ear then transmits the eardrum’s vibrations through a piston made of three tiny bones (hammer, anvil, stirrup) to the cochlea, a snail-shaped tube in the inner ear o The incoming vibrations cause the cochlea’s membrane to vibrate, jostling the fluid
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Module 14 - 20:49 Objective 14-1 We hear sounds with...

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