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The g factor [a] is a construct developed in psychometric investigations of cognitive abilities and human intelligence.It is a variable that summarizes positive correlations among different cognitive tasks, reflecting the assertion that an individual's performance on one type of cognitive task tends to be comparable to that person's performance on other kinds of cognitive tasks.
The book traces the origins of the idea of individual differences in general mental ability to 19th century researchers Herbert Spencer and Francis Galton. Charles Spearman is credited for inventing factor analysis in the early 20th century, which enabled statistical testing of the hypothesis that general mental ability is required in all mental efforts.
The Army Alpha was a test that assessed verbal ability, numerical ability, ability to follow directions, and general knowledge of specific information. The Army Beta was its non-verbal counterpart used to evaluate the aptitude of illiterate , unschooled , or non-English speaking draftees or volunteers .
The existence of motor equivalence, i.e., the ability to perform the same action in multiple ways for instance using different muscles or the same muscles under different conditions. This suggests that a general code specifying the final output exists which is translated into specific muscle action sequences
The Dean–Woodcock Structured Interview and the Dean–Woodcock Emotional Status Examination provide information regarding the patient's history and current psychological and medical functioning. They address the need in neuropsychological assessment to consider factors that may inhibit or facilitate a patient's performance.
The General Aptitude Test Battery (GATB) is a work-related cognitive test developed by the U.S. Employment Service (USES), a division of the Department of Labor. It has been extensively used to study the relationship between cognitive abilities, primarily general intelligence, and job performance. [1] [2]
Research has been done to investigate if g scores are made up of scores from Differential Ability Scales, s factors, and how the law of diminishing returns compare to Spearman's Law of diminishing returns. [4] With the use of linear and nonlinear Confirmatory Factor Analysis, it is showing that the nonlinear model best described the data. [4]
Inessential information around the test: Muchinsky, P.M. (2004). "Mechanical aptitude and spatial ability testing". In Jay C. Thomas; Michel Hersen (eds.). Comprehensive Handbook of Psychological Assessment. Vol. 4: Industrial and organizational assessment. Hoboken, NJ: John Wiley and Sons. p. 26. ISBN 978-0-471-41614-2