Intelligence, IQ, Public Opinion and Scientific Psychology Alfred H. Shephard, University of Manitoba The Journal of Mind and Behavior, Spring 1981, Vol. 2, No. 1, Pages 1-26, ISSN 0271-0137 Many psychologists have made unjustifiable inferences from data by interpreting IQ as a causal variable when logically it is a non-causal variable. Attempts are made in