PSYA01H3 Chapter Notes - Chapter 4: Sensorineural Hearing Loss, Olfactory Bulb, Auditory Cortex
Document Summary
Hearing: inform you about the nature of the sound source. Sound waves: changes in mechanical pressure transmitted through solids, liquids or gases. Frequency: wavelength measured in hertz (hz), number of cycles a sound wave travels per second. o. Pinna: outer region that helps channel sound waves to the ear and allows you to determine the source or location of a sound. Auditory canal: extends from pinna to the eardrum: vibrating eardrum. Ossicles (hammer, anvil, stirrup): three tiny moveable bones: eardrum attaches to these bones. Cochlea: fluid-filled membrane that is coiled in a snail-like shape and contains the structures that convert the sound into neural impulses. Sound localization: process of identifying where sound comes from: handled by a midbrain structure called inferior colliculus. High frequency sounds stimulate hair cells closest to ossicles. Lower frequency sounds stimulate hair cells toward end of cochlea.
