Cognitive elite is a term coined by the author of what 1984 book?
Cognitive elite: The cognitive elite of a society, according to Richard J. Herrnstein and Charles Murray, are those having higher intelligence levels and thus better prospects for success in life. Charles Murray (political scientist):  His book "Losing Ground: American Social Policy 1950–1980" (1984), which discussed the American welfare system, was widely read and discussed, and influenced subsequent government policy.
Losing Ground: American Social Policy 1950–1980