Überprüfung und genetische Interpretation der Divergenzhypothese von Wewetzer

Age and ability differentiation in children: A review and empirical investigation.

“…Five of the studies using a grouping approach did not find any evidence for ability differentiation (Amelang & Langer, 1968; Bloom et al, 1988; Brown, 1926; Facon, 2004; Mitchell, 1956), with one reverse effect (Bloom et al, 1988). Two studies that used a grouping approach descriptively pointed to ability differentiation without reaching statistical significance (Lienert, 1961; Lienert & Faber, 1963). Five studies that used a grouping approach provided partial support for ability differentiation, finding differentiation only with one of several employed methods (Coyle, 2003; Lynn & Cooper, 1993; Maxwell, 1972; Spearman, 1927) or in a subsample (Arden & Plomin, 2007).…”

Spearman's “Law of Diminishing Returns” tested with two methods

“…When consulting the literature the majority of studies support SLODR (ability) (e.g., Abad, Colom, Juan-Espinosa, & Garcia, 2003;Baumeister & Bartlett, 1962;Birren, 1952;Carlstedt, 2001;Coyle, 2002;Deary et al, 1996;Der & Deary, 2002;Detterman & Daniels, 1989;Detterman et al, 1992;Evans, 1999;Filella, 1960;Jäger, 1964;Jäger & Todt, 1964;Jensen, 2003;Kane, 2000;Legree, Pifer, & Grafton, 1996;Lienert, 1961Lienert, , 1964Lienert & Faber, 1963;Lynn, 1992;Lynn & Cooper, 1993, 1994Mitchell, 1956;Maxwell, 1972;Nesselroade & Thompson, 1995;Reinert, Baltes, & Schmidt, 1965;Segel, 1948;Spearman, 1927;Wewetzer, 1958) but some studies either find no difference in g saturation or find the opposite pattern (Amelang & Langer, 1968;Bloom et al, 1988;DeVoss, 1926;Eyferth, 1963;Facon, 2004;Fogarty & Stankov, 1995;Hartmann & Teasdale, 2004, accepted for publication; Roesslein, 1953). However, not all studies are equally valid and it is therefore necessary to look at the individual studies in order to investigate whether the specific study controls for potential confounders.…”