The Colorado Adoption Project provides an especially vivid illustration of fade-out. Nurture effects were already visible when the children were one to two years old and peaked when they were three to four years old. Toddlers adopted by parents in the 80th percentile of IQ scored about 7 percentage points higher than average. By the time the adoptees were age seven, however, two-thirds of this nurture effect was gone. By twelve, nothing was left. As the researchers bluntly concluded, “Adopted children resemble their adoptive parents slightly in early childhood but not at all in middle
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This is an indictment of iq measures not of anything else
