sbl...@ubishops.ca 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.
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?
Ken
Stephen
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Stephen L. Black, Ph.D.
Professor of Psychology, Emeritus
Bishop's University
e-mail: _sbl...@ubishops.ca_
2600 College St.
Sherbrooke QC J1M 1Z7
Canada
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Kenneth M. Steele, Ph.D. steel...@appstate.edu
Professor and Assistant Chairperson
Department of Psychology http://www.psych.appstate.edu
Appalachian State University
Boone, NC 28608
USA
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