PSY 101 Chapter Notes - Chapter 20: Endorphins, Middle Ear, Sensorineural Hearing Loss
16 Oct 2016
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Module 20: the nonvisual senses: hearing/ audition. The stimulus input: sound waves: amplitude of sound waves determine loudness. Long waves = low frequency = low pitch. Short waves = high frequency = high pitch. Sound measured in decibels: zero decibels = absolute hearing threshold. The ear: outer ear- where sound first enters. Basilar membrane- moves, bending the hair cells- triggers impulses in nerve cells: axons of these nerve cells form the auditory cortex in the temporal lobe, causes of hearing loss: Sensorineural hearing loss- caused by damage to cochlea"s hair cell receptors: conduction hearing loss- caused by damage to the mechanical system that conducts waves to the cochlea. Less common: cochlear implant- electronic device that transmits sounds into electrical signals that are wired into the cochlea"s nerves. Loudness is interpreted by the number of activated hair cells. Place theory- theory that different pitches are heard because different sounds trigger activity at different places in the cochlea"s membrane.
