PSYC 2410 Chapter Notes - Chapter 7: Ventral Posterior Nucleus, Vestibulocochlear Nerve, Medial Lemniscus

• School: University of Guelph
• Department: Psychology
• Course: PSYC 2410
• Professor: Elena Choleris

Document Summary

Fourier analysis: can break down complex sound wave in to simpler frequency, amplitude, timbre waves and adding up these simple waves gives you back the complex wave. Rarefaction: sound particles are far apart (negative pressure) Outer ear (pinnae, auditory canal) tympanic membrane (ear drum) middle ear (3 ossicles malleus, incus, stapes, eustachian tube from throat equalization, cold, air filled) oval window. Cochlea (contains organ of corti basilar and tectorial membranes, fluid filled) hair cells (receptors, graded lengths, respond to mechanical stimulus, k+ and ca2+ ion channels) auditory nerve (viii) or round window (vibration dissipates) Don"t know much about chemical basis of channels because the protein is low in abundance and they are hard to grow in vitro. Higher frequency sound waves peak closer to the oval window while lower frequencies peak closer to the apex (tonotopic organization) Deafness (~1%), rare because other pathways remain. Conductive deafness: due to damaged, malformed, inhibited by cold, ossicles.