Joseph M. Horn
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'''Joseph M. Horn''' is an American [[psychology]] professor known for his work on adoption studies.
Horn received his Ph.D. from the [[University of Minnesota]] and currently teaches at the [[University of Texas at Austin]]. Research interests include intellectual and personality development, [[behavior genetics]], personality, individual differences, and vocational behavior.
Horn is a [[Pioneer Fund]] grantee. Of interest to the Pioneer Fund is Horn's [[Texas Adoption Project]] started in [[1972]], a [[longitudinal study]] of over 500 adopted children, their biological mothers, and adoptive parents and siblings. The controversial Pioneer Fund claims that Horn's work is evidence of a [[hereditarian]] influence:
<blockquote>The first phase of the study tested the personality and intelligence of adopted children between three and fourteen years-old; then the study re-tested them again as adolescents and young adults ten years later. Not only were the adoptees much more like their biological mothers than their adoptive mothers, but as they grew older, they became increasingly more similar to the biological parents they had not seen since shortly after their birth, and the less like the adopting parents who had raised them. By adolescence, the adoptees showed virtually no similarity to their adopting parents or the adoptive siblings with whom they had been raised. The study concluded that about fifty percent of the individual differences in IQ and personality were due to heredity and the remainder to environmental influences.</blockquote>
In 1994 he was one of 52 signers to an opinion piece "[[Mainstream Science on Intelligence]]," written by psychologist [[Linda Gottfredson]] and published in the ''[[Wall Street Journal]]'' defending the controversial claims and conclusions on [[race and intelligence]] in ''[[The Bell Curve]]''. <ref name="gottfredson">Gottfredson, Linda (December 13, 1994). [[Mainstream Science on Intelligence]]. ''[[Wall Street Journal]]'', p A18.</ref>
==Selected works==
* Horn, J. M., Loehlin, J. C., & Willerman, L. (1979). Intellectual resemblance among adoptive and biological relatives. Behavior Genetics, 9, 177-207.
* Horn, J. M. (1983). The Texas Adoption Project: Adopted children and their intellectual resemblance to biological and adoptive parents. Child Development, 54, 268-275.
* Loehlin, J. C., Horn, J. M., & Willerman, L. (1990). Heredity, environment, and personality change: Evidence from the Texas Adoption Project. Journal of Personality, 58, 221-243.
== References ==
{{reflist}}
== External links ==
*[http://www.psy.utexas.edu/psy/FACULTY/Horn/Horn.html Joseph Horn webpage] at [[University of Texas at Austin]]
*[http://www.pioneerfund.org/Grantees.html Highlights of Pioneer Fund Research and Grantees]
{{DEFAULTSORT:Horn, Joseph M.}}
[[Category:American academics]]
[[Category:Behavior geneticists]]