Longitudinal research by Giedd

4 important questions on Longitudinal research by Giedd

What were some of the key findings from Giedd's study on brain development?

- Total brain volume at age 6 is 90 percent of adult size and remains stable after
- Male brain is 12 percent bigger than female brain
- Total gray matter decreases while white matter increases
- Gray matter in each lobe shows an inverted U-shape, with pruning after a peak
- Gray matter loss occurs earliest in primary sensorimotor areas and latest in dorsolateral prefrontal cortex

What distinguishes Giedd's study on brain development from cross-sectional research?

- Giedd's study is a within-subjects design
- Involves longitudinal data
- Age ranges from 6–23 years

What are some notable observations regarding gray matter development in Giedd's study?

- Gray matter shows an inverted U-shape pattern in each lobe
- There is an increase followed by a decrease in gray matter, reflecting changes in size and complexity
- Gray matter loss occurs earliest in primary sensorimotor areas and latest in the dorsolateral prefrontal cortex
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Describe the changes in brain volume over time based on Giedd's study findings.

- Total brain volume at age 6 is 90 percent of adult size and remains stable
- Male brain is 12 percent bigger than female brain, even when considering height and weight
- White matter increases linearly from age 6 into the early 20s

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