Mental growth

Abstract

Various forms of the National Intelligence Tests were given to 183 children at semi-annual intervals for six consecutive times. Results indicated that the IQ's remained fairly constant, exceptions being found in a slight general rise during the school year with a corresponding drop during the summer months, and a slight rise for the whole group over the entire period. Nearly parallel mental growth curves were found for all IQ levels. (PsycInfo Database Record (c) 2025 APA, all rights reserved)