PSYC 273 Study Guide - Midterm Guide: Stratum Basale, Hearing Aid, Vestibulocochlear Nerve
Document Summary
Infrasound: very low frequency; less than 10 hz, three bones of middle ear, ossicles, malleus, stapes. Incus: they move the oval window, pathway of sound, pinnae funnels sound waves into the ear canal, the middle ear concentrates sound energy. Incoming sounds hit tympanic membrane moving the ossicles which then more the oval window. Individual fibers selectively fire for specific frequency; nearby frequency require more intense stimuli: main activation is in the primary auditory cortex, efferent/afferent, efferent, from brain, afferent, to brain. Inner hair cell (ihc) afferents: convey action potentials that provide sound perception to brain. Movement of their stereocilia are the action potentials that travel along vestibulocochlear nerve. Ihc efferents: lead f(cid:396)o(cid:373) the (cid:271)(cid:396)ai(cid:374) to the ihc"s allo(cid:449)i(cid:374)g the (cid:271)(cid:396)ai(cid:374) to (cid:272)o(cid:374)t(cid:396)ol (cid:396)espo(cid:374)si(cid:448)e(cid:374)ess of. Inability of hair cells to produce action potentials: overexposure to loud music, medication, infection, central deafness.
