FRHD 1010 Lecture Notes - Autobiographical Memory, Cerebral Cortex, Permanent Teeth

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The typical 3 year old is 35 inches tall and weighs about 30 pounds; the typical 6- year old is about 45 inches tall and weighs about 45 pounds. By their third birthday y most children have a full set of 20 teeth. These are their primary or baby teeth that will be replaced by 32 permanent teeth in the course of childhood, beginning at about age 6, and lasting until about age 14. At age 3 the brain is about 70% of its adult weight, and at age 6 about 90%. The average 6 year olds body weight is less than 30% what it will be in adulthood, so the growth of the brain outpaces the rest of the body. The increase in brain size and weight during early childhood is due to an increase in dendritic connections between neurons and to myelination. Four parts of the brain are especially notable for their myelination during early childhood.

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