Studied by 8 peopleMaturational period (1930s-1940s)
-led by Arnold Gesell and myrtle McGraw
-documented infants process of movement EX. Sit, crawl, stand, walk, run
-their documentation is critical to what we understand today
Normative/ descriptive period (1946-1970s)
-work led to motor devlopment as a separate field of study within phys ed and kin
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