An IQ test is attempt to measure what a person’s physical potential for intelligence is. It is not a very accurate test – if you tried to measure someone’s physical potential for strength based on what physical feats they could perform now, the upper limits of performance would be a guess at best, even if you were to measure things on a cellular level because we have an incomplete understanding of how strength and endurance training change the body.
In a similar way it is difficult to extrapolate what the maximum intelligence potential could be based on current state. Physical limitations to intelligence must exist, otherwise it would be possible to teach a dog to be a chess grand master, but it is difficult to arrive at a conclusion of what the limits are based on a series of tests.
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