Heritability is defined as the proportion of a manifested trait's varience that is due to genetic variation. Sixty-five pairs of twins were employed to investigate the heritability of: (1) short term memory (Jensen's Level 1), operationalized using of modified "digit span" test; (2) the general intellective factor (Jensen's Level II),…

The importance and consequences of raising the average ability level (IQ) of the population requires consideration of the ability level that society requires, how the relevant abilities are distributed, and the efficiency of the current educational process. Within the framework of these factors, the document discusses the determinants of mental…

In these hearings, the following witnesses presented testimony: Dr. Henry E. Garrett, Chairman, Psychology Department (Emeritus), Columbia University; Dr. Arthur R. Jensen, Professor of Educational Psychology, University of California at Berkeley; Dr. Frank C. J. McGurk, Professor of Psychology, University of Montevallo; Dr. R. Travis Osborne,…