Roy Porter Quotes & Sayings

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Every age gets the lunatics it deserves. — Roy Porter

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Errors of reductionism and biodeterminism take over in such silly statements as "Intelligence is 60 percent genetic and 40 percent environmental." A 60 percent (or whatever) "heritability" for intelligence means no such thing. We shall not get this issue straight until we realize that the "interactionism" we all accept does not permit such statements as "Trait x is 29 percent environmental and 71 percent genetic." When causative factors (more than two, by the way) interact so complexly, and throughout growth, to produce an intricate adult being, we cannot, in principle, parse that being's behavior into quantitative percentages of remote root causes. The adult being is an emergent entity who must be understood at his own level and in his own totality. The truly salient issues are malleability and flexibility, not fallacious parsing by percentages. A trait may be 90 percent heritable, yet entirely malleable."
Author: Stephen Jay Gould

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