TEOAEs are generally known as click

TEOAEs are generally known as click-evoked OAEs, although chirp stimuli can also produce transient OAEs. To record a TEOAE, clicks of very short duration (about 80 µs) are delivered to the ear in alternating polarity to cancel out the stimulus and leave the response to be analyzed. The first few milliseconds of the response is discarded and then the response is analyzed using fast Fourier transform (FFT) mathematics to separate out the frequency components of the response. Due to the tonotopic organization of the cochlea and the nature of the traveling wave, the TEOAE provides frequency-specific analysis of cochlear function even though the click stimulus is broad-band. A common misconception is that TEOAEs are not frequency-specific. They do provide some frequency specificity, although the stimulus cannot be controlled for level versus frequency, as it is shaped by the resonant properties of the ear canal. Thus, the bandwidth of the TEOAE response is primarily in the 1–4 kHz region. An advantage of TEOAEs is that only one stimulus evokes a broad frequency response and reveals fine structure, but a disadvantage is a limited response above 4 kHz.