本当はLeta Hollingworthという心理学者が語った以下のものでした。


The Myth of The 30 IQ Point “Communication Range”

話がすり替わったのは、1987年にGrady M. Towersという著者が書いた「Prometheus Society」という雑誌の記事「The Outsiders」が発端のようです。

Hollingworth’s second seminal idea is that of a “communication range.” She does not state this explicitly, but it can be inferred from some of her comments on leadership.

Observation shows that there is a direct ratio between the intelligence of the leader and that of the led. To be a leader of his contemporaries a child must be more intelligent but not too much more intelligent than those to be led… But generally speaking, a leadership pattern will not form–or it will break up–when a discrepancy of more than about 30 points of IQ comes to exist between leader and led [3, p. 287].

The implication is that there is a limit beyond which genuine communication between different levels of intelligence becomes impossible. To say that a child or an adult is intellectually isolated from his contemporaries is to say that everyone in his environment has an IQ at least 30 points different from his own. Knowing only a person’s IQ, then, is not enough to tell how well he’s likely to cope with his environment. Some knowledge of the intellectual level of his environment is also necessary.
The Outsiders | Grady M. Towers




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