Exam 1 (OAE - TEOAE) 2023 with correct solutions

George von Bekesy correct answers-traveling wave theory -cochlea functions "passively" (1940's) wave travels from basal end to apex and peaks of waves appear at different points depending on frequency Thomas Gold correct answers-active processes (1948) -1. A feedback system exists in the cochlea -2. Observed on a live cochlea, the frequency response curve should rise and cut off more steeply. David Kemp correct answersDr. Kemp found existing evidence that support active processes of the cochlea. He recorded acoustic signals in human ears: spontanous acoustic emissions, stimulated acoustic emissions (aka Kemp's echos/TEOAEs), evoked cochlear mechanical response (aka DPOAEs) -He suggested: cochlear origin of the OAEs and contribution of OHCs in the generation of OAEs why are transient evoked OAEs called "Kemp echoes"? correct answersDavid Kemp presented a stimulus to the cochlea and the cochlea produced an "echo" back. This is now called transient evoked otoacoustic emissions. what are the two categories of OAEs correct answers-Spontaneous -Evoked what are the four types of OAEs correct answers-Spontaneous OAEs (SOAEs): recorded without external acoustic stimulation -Stimulus Frequency OAEs (SFOAEs): recorded by presenting a constant pure-tone stimulus -Transient evoked OAEs (TEOAEs): recorded by presenting a very abrupt acoustic signal (click or toneburst) -Distortion product OAEs (DPOAEs): recorded by presenting two constant pure tones, closely spaced in frequency (harmonics)