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.[4]

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Australia has a large child care industry,[72] however in many locations (especially in inner-city suburbs of large cities and in rural areas) the availability is limited and the waiting periods can be up to several years.[73] The Australian government's Child Care Subsidy[74] scheme provides generous assistance with child care costs, but this still leaves many families with a large out of pocket expense. The median weekly cost of centre-based long day care in 2013 was approximately A$364[75] which puts it out of the reach of lower income earners.[76] http://y2u.be/eeCahRCgOfI