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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According to Chris Knight, the first humans were few; then the population "exploded .... Population expansion on such a scale is inconsistent with female tolerance of infanticide, harassment, or the heavy costs to mothers of male philandering and double standards. If unusually large numbers of unusually large-brained offspring were being successfully raised to maturity, the quality of childcare must have been exceptional. We know what the optimal solution would have been. There can be no doubt that mothers would have done best by ... taking advantage of every available childcare resource."[44]

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Licensed or unlicensed home daycare is also referred to as family child care, or in home care. It refers to the care provided to a group of children in the home of a caregiver. State laws differ regarding rules for licensed versus unlicensed care. In Canada, most home daycares are unlicensed, and this is completely lawful. Licensing home daycares in Canada can help greatly with oversight, but at the cost of a large portion of the daycare provider's pay. Family child cares are small in size and provide families the same securities as a daycare center, and also has the benefits of flexible hours, lower costs, accessibility, and cultural compatibility. Home-based providers can give more individualized care and therefore better meet the needs of working families. In addition, family care generally has a small ratio of children in care, allowing for more interaction between child and provider than would be had at a commercial care center. Family child care helps foster emotionally secure interpersonal relationships for everyone involved. The providers are able to communicate each day with parents on a personal level and share information about the development of the child. Providers care for multi-aged groups of children allowing children to remain with one caregiver for many years which helps children develop a sense of trust and security. Multi-aged settings allow children to learn from one another and allow siblings to stay together. Some family child care providers may offer parents more flexibility with hours of operation such as evening, weekend, overnight, and before and after school care. In the United States, some family child care providers work with companies such as Wonderschool, for assistance in licensing, operations, marketing, and administrative support.[9] http://m.www.youtube.com/embed/eeCahRCgOfI
We recognize that there are good reasons to make changes in early childhood education and care (ECEC) in Ontario.  But we believe that these must be based on the best available evidence about what is of most benefit to children and families; we argue that these proposed changes are not. Additionally, we suggest that changes in ECEC in Ontario will continue to have negative effects if they continue to be “piecemeal”.

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The National Institute of Health released a study in March, 2007 after following a group of children through early childhood to the 6th grade.[89] The study found that the children who received a higher quality of childcare scored higher on 5th grade vocabulary tests than the children who had attended childcare of a lower quality. The study also reported that teachers found children from childcare to be "disobedient", fight more frequently, and more argumentative. The study reported the increases in both aggression and vocabulary were small. "The researchers emphasized that the children’s behavior was within the normal range and were not considered clinically disordered." http://youtube.com/e/eeCahRCgOfI
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