Ken asked - Stephen's comment raises an interesting point is thinking about partitioning gene-environment effects. Would it be correct to say that the process of growing up produces an increase in homogeneity of environmental influences across individuals?
Or, to put the issue differently, do environmental effects disappear (mathematically) because of loss of environmental variance? my answer - Some of the behavioral geneticists that I have read suggest that environmental variance becomes more closely correlated with genetic variance as children develop. Scarr and McCartney refer to this as an active genotype to environment effect, I think that Plomin refers to it as an active genotype/environment correlation. Plomin's idea was published first. The Scarr and McCartney paper was in Child Development in 1985. I can find the exact references in my office on Monday if you are interested. Dennis ------------------------------------------------------------------------------------------------------------------ Dennis M. Goff Charles A. Dana Professor of Psychology Department of Psychology Randolph College (Founded as Randolph-Macon Woman's College in 1891) Lynchburg VA 24503 -----Original Message----- From: Ken Steele [mailto:[email protected]] Sent: Fri 11/20/2009 12:18 PM To: Teaching in the Psychological Sciences (TIPS) Subject: Re: [tips] nature versus nurture: more general discussion [email protected] wrote: > > For IQ, the figure for heritability is generally found to be higher, > typically in the 0.70 range, although there is a wide range of > estimates. In school-aged children, while they are still at home, the > figure is lower, and there is a clear shared environment effect. . So > parents do seem to matter. But there's a catch which many don't seem to > know about. This is only true in the child. As the child gets older and > leaves the home, less and less of the environmental component can be > attributed to shared effects, and as a adult, the shared component > largely disappears. So parents matter at first to IQ, but later, very > little. Ken > > Stephen > > ----------------------------------------------------------------- > Stephen L. Black, Ph.D. > Professor of Psychology, Emeritus > Bishop's University > e-mail: [email protected]_ > 2600 College St. > Sherbrooke QC J1M 1Z7 > Canada > ----------------------------------------------------------------------- --------------------------------------------------------------- Kenneth M. Steele, Ph.D. [email protected] Professor and Assistant Chairperson Department of Psychology http://www.psych.appstate.edu Appalachian State University Boone, NC 28608 USA --------------------------------------------------------------- --- To make changes to your subscription contact: Bill Southerly ([email protected]) --- To make changes to your subscription contact: Bill Southerly ([email protected])
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