Well yes; if nothing else early agricultural societies were probably rather malnourished outside the elite. But chopping twenty points off an average person’s IQ does not make him “intellectually disabled”, just excruciatingly slow. As opposed to merely painfully slow.
But chopping twenty points off an average person’s IQ does not make him “intellectually disabled”, just excruciatingly slow.
The usual boundary for “mentally disabled” is IQ 70. There are a LOT of IQ 90 people walking around, chopping off twenty points won’t work well for them.
And a warning—as was pointed to me recently IQ points are really ranks. There is no implication that a one point difference (or a twenty point difference) means the same thing in the 70 − 90 context as in the, say, 120 − 140 context.
Well yes; if nothing else early agricultural societies were probably rather malnourished outside the elite. But chopping twenty points off an average person’s IQ does not make him “intellectually disabled”, just excruciatingly slow. As opposed to merely painfully slow.
The usual boundary for “mentally disabled” is IQ 70. There are a LOT of IQ 90 people walking around, chopping off twenty points won’t work well for them.
And a warning—as was pointed to me recently IQ points are really ranks. There is no implication that a one point difference (or a twenty point difference) means the same thing in the 70 − 90 context as in the, say, 120 − 140 context.