PSYCH 1XX3 Chapter Notes - Chapter 8: Sound Intensity, Temporal Lobe, Retina
Document Summary
Vary from a range of frequencies that can be heard. Audible range is determined by structure of auditory system. Basilar membrane: contain hearing receptors; different frequencies are processed along different. Varies in length for species: longest in mammals and shortest in amphibians and reptiles. Sound waves are created by vibrating object, which cause the air molecules around the sound to move chain reaction of moving air particles. Sound waves are graphed as sine waves. Normal convo: 60 db; whisper: 27 db; concert: 120 db. Timbre: combination of fundamental sounds and overtones = complex sound we. Objects vibrate to make a sound = fundamental tone, but it also vibrates in shorter. Changes in air pressure are channeled through the outer ear, onto the middle ear, and amplified changes in fluid pressure in the inner ear auditory neural impulses. Outer ear: pinna collects sound waves ear canal, ear canal narrows eardrum.
