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researchers on whether or not intelligence was hereditary. There are still recurring debates about the influence of environment and heredity upon an individual's intelligence.

In a 1926 research paper, psychologist L.L. Thurstone labeled the concept of mental age "a failure" that led to "ambiguities and inconsistencies."

In the 21st century, some disabled activists, advocates, and researchers have labeled the concept of mental age inaccurate, reductive, or infantilizing and argued for the

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