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In 2009, Stephen Beeby of The University of Southampton led research into utilizing otoacoustic emissions for biometric identification. Devices equipped with a microphone could detect these subsonic emissions and potentially identify an individual, thereby providing access to the device, without the need of a traditional password.[15] It is speculated, however, that colds, medication, trimming one's ear hair, or recording and playing back a signal to the microphone could subvert the identification process.[16]
The evoked responses from these stimuli occur at frequencies ( {\displaystyle f_{dp}} ) mathematically related to the primary frequencies, with the two most prominent being {\displaystyle f_{dp}=2f_{1}-f_{2}} (the "cubic" distortion tone, most commonly used for hearing screening) and {\displaystyle f_{dp}=f_{2}-f_{1}} (the "quadratic" distortion tone, or simple difference tone).[6][7]
It has been found that distortion product otoacoustic emissions (DPOAE’s) have provided the most information for detecting mild hearing loss in high frequencies when compared to transient evoked otoacoustic emissions (TEOAE).[13] This is an indication that DPOAE’s can help with detecting an early onset of noise-induced hearing loss. A study measuring audiometric thresholds and DPOAEs among individuals in the military showed that there was a decrease in DPOAEs after noise exposure, but did not show a shift in audiometric threshold. This supports OAEs as predicting early signs of noise damage.[14]
Deciding which child care center you trust to take care of your child is no easy choice to make. With 19 preschools and child development centers in ZIP Code 80016, we like your chances. Take a look at the options below and see the great services they have to offer your family. Be sure to check out the reviews and past inspection information on the provider listing, and if you have any past experience with a provider, please leave an honest review to help other parents in a similar situation.