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.
Some of the child rearing advice was unexpected: p. 203 "no parents can really play with their children" because they have "too much responsibility, too many disappointments, too much school learning to play" and "Don't play with your children, just do your stuff-laundry, cooking, gardening, mowing the lawn, bird watching." Perhaps the authors began writing the section to stress the importance of letting children have creative play rather than structuring all playtime with activities and parental narration, but they composed a message of 'do your chores and leave your child to do his own thing.' Again, there were no references in this brief section, though there are plenty of sources the authors could have drawn from if they had done some research.
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