When1: 1927
Who: Charles Edward Spearman [Spearman, Charles Edward]
What: psychologist
Where: USA
works\ Abilities of Man [1927]
Detail: He lived 1863 to 1945, studied cognition principles, invented tetrad equation, and developed a two-factor intelligence theory. Perhaps, intelligence has general factor {mental energy}, which allows good performance on all mental tests {general ability}. General factor results from relations among primary intelligence factors.
Social Sciences>Psychology>History>Cognition
6-Psychology-History-Cognition
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Date Modified: 2022.0224