AGE-INTELLIGENCE RELATIONSHIP BETWEEN AGES 16 AND 64 - RISING TREND

4 stratified, random groups, ages 25-29, 35-39, 45-49, and 55-64, were drawn from the Puerto Rican population during the selection of the standardization sample for the Spanish language WAIS. These groups were altered by the substitution of sufficient cases to make their educational distributions nearly identical. All Ss were administered the newly adapted Spanish language version of the WAIS during the period in which its standardization was being conducted. Results indicate that Full Scale score means rise to age 40 and never fall; verbal total scaled means rise to age 50 and never fall; performance total shows a small decline after age 40 due primarily to Digit Symbol Substitution. Various analyses of the Spanish WAIS and of the United States WAIS standardization data give strong support to these results. (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1969 American Psychological Association.