Leon J. Kamin (born December 29, 1927 in Taunton, Massachusetts) is an American psychologist known for his contributions to learning theory and his critique of estimates of the heritability of IQ. He studied under Richard Solomon at Harvard and discovered several important facts about conditioning, including the "Kamin Effect" and the "blocking effect".

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  • Leon J. Kamin (born December 29, 1927 in Taunton, Massachusetts) is an American psychologist known for his contributions to learning theory and his critique of estimates of the heritability of IQ. He studied under Richard Solomon at Harvard and discovered several important facts about conditioning, including the "Kamin Effect" and the "blocking effect". Kamin was blacklisted during the McCarthy era (Kamin, 2005) and had to find employment in Canada, where he chaired the Psychology Department at McMaster University in Ontario, Canada (1957–68). When he was removed from the blacklist in 1968, he returned to the US and chaired Princeton University's Department of Psychology and later the Psychology Department at Northeastern University in Boston, MA.Kamin's most well-known contribution to learning theory was his discovery and analysis of the "blocking effect" (1969). He showed that conditioning an animal to associate a salient conditioned stimulus (CSb), such as a bright light, with a salient unconditioned stimulus (US), like a shock, is "blocked" when CSb is presented simultaneously with another conditioned stimulus (CSa) that was already conditioned to the US. (Kamin used rats in most of his research, but the effect has been found in many animals). The blocking effect is one of the hallmark effects in the study of associative learning in animals, including humans.Kamin has long opposed the idea that significant personal traits are largely heritable. He became skeptical of the claims of Cyril Burt regarding the heritability of IQ, and published his findings in a 1974 book The Science and Politics of IQ. He co-authored the controversial book Not in Our Genes (1984) with geneticist Richard Lewontin and neurobiologist Steven Rose. This book, championing the "radical science movement," attacked sociobiology and evolutionary psychology. Kamin is known in some circles for his position that the heritability of IQ could be zero (Mackintosh, 1998)He is honorary professor of psychology at the University of Cape Town in South Africa.
  • Leon J. Kamin (* 29. Dezember 1927 in Taunton, Massachusetts) ist ein US-amerikanischer Psychologe.
  • Leon J. Kamin (Taunton, 29 dicembre 1927) è uno psicologo statunitense.È professore emerito della Northeastern University di Boston, ha condotto ricerche sulla relazione tra comportamento sociale e biologico.
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  • Leon J. Kamin (* 29. Dezember 1927 in Taunton, Massachusetts) ist ein US-amerikanischer Psychologe.
  • Leon J. Kamin (Taunton, 29 dicembre 1927) è uno psicologo statunitense.È professore emerito della Northeastern University di Boston, ha condotto ricerche sulla relazione tra comportamento sociale e biologico.
  • Leon J. Kamin (born December 29, 1927 in Taunton, Massachusetts) is an American psychologist known for his contributions to learning theory and his critique of estimates of the heritability of IQ. He studied under Richard Solomon at Harvard and discovered several important facts about conditioning, including the "Kamin Effect" and the "blocking effect".
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  • Leon Kamin
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