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Right- and Left-Handedness
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Script: By 8 weeks, 75% of embryos exhibit right-hand dominance. The remainder is equally divided between left-handed dominance and no preference. This is the earliest evidence of right- or left-handed behavior. | ||
| All ages referenced to fertilization, not last menstrual period. |
Ovaries Identifiable
The Highly Complex Brain
Right- and Left-Handedness
Rolling Over
Spontaneous Movement
Reflexive Movement
