PSYCH 1XX3 Lecture Notes - Lecture 11: Fundamental Frequency, Basilar Membrane, Ear Canal
3 Jul 2017
School
Department
Course
Professor
Document Summary
Longer basilar membrane = wider range of frequencies. Frequency measure of pitch: frequency cycles per seconds (hertz hz); longer wavelength = smaller frequency, high frequency = high pitched sound, frequencies humans able to detect only a portion of frequencies out there. The ear: dived into external, middle, inner, changes in air pressure channeled through external, onto middle, amplified in inner to be detected as fluid changes, fluid changes converted to auditory neural impulses. Hair cells: auditory receptors housed by basilar membrane, bend in response to sound and fire neural impulses (action potential. Outer hair cell link shared by 30 other outer hair cells function to amplify slower thin and unmyelinated. Inner hair cell afferent fibers, 20 direct links less numerous more connections to brain 20 faster thicker and myelinated. Cochlear nucleus: neurotransmitters emitted by hair cells trigger epsp in cochlear nerve fibers sending signal to cochlear nucleus in hind brain the nucleus has separate dorsal and ventral streams.
