PSY 457LEC Lecture Notes - Lecture 5: Conductive Hearing Loss, Cochlear Implant, Sensorineural Hearing Loss
Document Summary
Sounds: series of pressure variations complex wave forms. Conductive hearing loss: interference with transmission of sound to inner ear (e. g. , blockage ear canal, infection middle ear) Sensorineural hearing loss: damage to hair cells in inner ear. Bypass hair cells auditory nerve is directly stimulated. Cochlear implant (outer: microphone (worn behind ear): picks up sound, transforms it into an electrical signal, sends it to the processor box. Speech processor box (pager size): filters sound, divides wave form into frequency bands, sends electrical signal to transmitter. Transmitter: transmits coded signals through skin to receiver. Cochlear implant (inner: receiver (on mastoid bone under skin): converts the code into signals that are sent to electrodes implanted inside the cochlea. Electrode array (wound through cochlea): sends signal through auditory nerve to brain. Some work suggesting age of implantation matters for later language outcomes. Here investigate the effect of age at implantation on auditory development of children who undergo implantation before age 3.
