A study of the mental growth curve with special reference to the results of group intelligence tests.

Abstract

ARCS 7 to 7-11 8 to 8-11 () to 9-11 10 to 10-11 11 to 11-11 12 to 12-11 13 to 13-11 14 to 14-11 15 to 15-11 10 to 10-11

The "laws" of relative variability of mental traits.

“…All show declines with age. Odom (60) collected data for the Otis, the National and the Illinois intelligence tests. They also show declines in V's with age.…”

Intelligence tests.

“…This extraordinary curve runs counter to all previously suggested growth curves. Odom (118) studies the results of group intelligence tests and arrives at the usual curve showing negative acceleration, but with no sign of an upper limit at C.A. 13 or 14.…”