Adoption studies can only find an influence of the environment to the extent that the adoptive environments for two siblings differ.
@emareaf this is the basis for pinker and others' qualification that nurture makes no difference within normal ranges
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@sarahdoingthing depends entirely on what are considered normal ranges. -
@emareaf should be more precise that "shared environment has no effect within adopter-class ranges" - 1 more reply
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