OAEs are considered to be related to the amplification function of the cochlea. In the absence of external stimulation, the activity of the cochlear amplifier increases, leading to the production of sound. Several lines of evidence suggest that, in mammals, outer hair cells are the elements that enhance cochlear sensitivity and frequency selectivity and hence act as the energy sources for amplification. One theory is that they act to increase the discriminability of signal variations in continuous noise by lowering the masking effect of its cochlear amplification.
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). 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.
Shawna Kay – Mom of two children in care. My youngest isn’t quite 1 yr old yet. How much more difficult do you need to make it for us? I barely make enough to cover daycare as it is, and that’s WITH subsidy! The ripple effect here is going to negatively impact so many. Please think of how much these changes are HURTING people who are just scraping by as it is!!!!
Hello my name is Nicole and together with my husband we run a very small in home day care. We have a unique program where our babies really grow up and learn together. We start with all new born babies then as they grow so does our daycare. We started as an infant nursery last year, then converted into a toddler nursery and now we are doing pre-school followed by a full preschool program next year. Then we will start over again!