PSYC 110 Chapter Notes - Chapter 14: Cochlear Implant, Heredity, Auditory Masking
Document Summary
Chapter 7 (269-279) hearing and psychophysics: hearing, sound and its transduction by the ear. Frequency --> pitch hertz: human -- 20-20,000 hz, naturally -- rarely have pure tones; so pitch attributed to dominant freq. Outer ear receive sound waves and transport inward: pinna, auditory canal: opening into head that ends at eardrum. Middle ear increase amt of pressure sound waves exert on inner ear for transduction: ossicles - hammer, anvil, stirrup, oval window, ossicles vibrate and push on oval window. Inner ear transduction: cochlea : transduction, outer duct : oval window to tip of cochlea to round window. Inner duct: basilar membrane (have receptor cells for hearing -- hair cells--- 4 rows of cilia 3outer 1inner, hair reaches inner duct to tectorial membrane; other end synapses w/ several auditory neurons forming auditory nerve. Traveling wave as a basis for frequency coding: bekesy. == high pitched sound: rapid firing in neurons from more distal == low pitched sound.