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Evidence of an Underlying Genetic Dichotomy for Certain Psychological Traits NSF

Stafford, Richard E.
Publication Year:
Report Number:
ETS Research Memorandum
Document Type:
Page Count:
Subject/Key Words:
National Science Foundation (NSF), Office of Naval Research, Cognitive Tests, Dichotomic Analysis, Heredity, Perception Tests, Psychological Characteristics, Twins


This paper was presented at the American Psychological Association Convention in September 1959; and in a modified version at the Annual Meeting of the American Society for Human Genetics in August 1959. A new method of dichotomic analysis, essentially a continuous series of goodness-of-fit tests was applied to test data from twins. Prediction was fairly well substantiated leading to the conclusion that there was good evidence for a basic dichotomy of genetic origin for specific traits even though the actual models for inheritance could not be ascertained.

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