Contends, based on a constructionist position on epistemology, that scientific knowledge (and knowledge of all kinds) is a construction of the human mind. Meaning is attributed to sensory data in theoretically guided inventions of “facts. ” At different times and places, facts invented in one theory become different facts in another. In each generation, psychologists have favored variables that serve loyally within the theoretical boundaries of the scientific wisdom of that time. It is argued that favored variables can blind scientists to other theories and other variables that could compete for favor. What makes theories and facts plausible is examined, and a continuum of persuasion, determined by the contexts of the theorists is proposed. Contemporary research on lead exposure and on parent–child interaction are examined as examples of facts that can become different facts in other theories
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