PSYC 3850 Chapter Notes - Chapter 7: National Down Syndrome Society, Intellectual Disability, Myelin

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The effects of environmental influences during infancy and early childhood are often more lasting and pervasive than during any later phase of the life cycle. The national down syndrome society is the largest national organization advocating for down syndrome and has a hotline. Physical development: major systems for physical development: gastrointestinal, renal, endocrine, skeletal, reproductive, neurological. Indirect investigation often occurs by observing a variety of performance areas and comparing a child"s functioning with age- appropriate levels. Head and brain characteristics: a child"s neurological development and capacity are related to head and brain size. The brain grows very rapidly during the prenatal period: this rapid growth continues after birth, a 2 year olds brain is approximately 90% of adult brain size. May be indirectly assessed by measuring the head circumference: normal circumference ranges for each gender and each difference stage. Example: the mean head circumference for male infants at birth is 34. 5 centimeters and reaches 49 centimeters by age 2.

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