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Selective Emigration, Roman Catholicism and the Decline of Intelligence in the Republic of Ireland

Richard Lynn


Published: 2015/03/01


Previous studies have shown that the mean IQ in the Republic of Ireland is 93 in relation to 100 for Britain and the rest of central and northern Europe. New evidence is presented giving an IQ of 88.3 in Ireland and therefore confirming this estimate. It is proposed that the causes of this lower IQ lies principally in the selective emigration of those with higher IQs over the course of several generations, with a smaller contribution from the dysgenic effect of Roman Catholicism.

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