The average mental age of adults

Abstract

Investigates the average mental age of adults by comparing the average intelligence of 9500 native whites, 3700 foreign-born men and 3300 Negroes. The intelligence of the former was judged on the basis of Army Mental Tests and that of the two latter groups was on the basis of the Surgeon General's report. The average mental age of adults was found to be 13 yrs and not 16 yrs as previously believed. Various other investigations supported this finding. Striking differences were observed between the average levels of general intelligence among the three groups of Ss, as well as among different social classes of native whites, different nationalities of people born abroad, and different geographical groups of Negroes. (PsycInfo Database Record (c) 2024 APA, all rights reserved)