PSYCH 1XX3 Lecture Notes - Basilar Membrane, Sound Localization, Tectorial Membrane
Document Summary
The auditory mechanisms of different species: audition varies across different species according to different needs, if different species were to communicate, they would need to communicate in the frequency overlap available to both species. Whales + dolphin 10 100,000 hertz wide. Hertz: longest basilar membrane among non mammal species, most other species can"t process frequencies over 10,000 hertz. Bands of air molecules push the eardrum inwards and outwards: denser = eardrum (tympanic membrane) inward, less dense = eardrum (tympanic membrane) outward. Pressure changes in sound waves can be graphed as a sine wave. 3 physical characteristics of a sine wave: loudness (amplitude, higher wave = louder sound, log rhythmic scale of decibels; perceived loudness doubles for every. Many sound frequencies exist outside our detectible range. Step four: then converted into auditory neural impulses. Pinna: collects & directs sound waves along the ear canal.
