Examined the assumption that Spearman's law acts unsystematically and approximately uniformly for various subtests of cognitive ability in an IQ test battery when high- and low-ability IQ groups are selected. Data from national standardization samples for Wechsler adult and child IQ tests affirm regularities in Spearman's "Law of Diminishing…

A correlation between intelligence level (IQ) and nerve conduction velocity (NCV) was demonstrated for 147 undergraduate students in the eastern San Francisco (California) Bay area. Recent studies of retarded subjects support the findings, explainable by positive correlations among NCV, speed of information processing, and IQ. (Author/SLD)

The degree to which human intelligence can be improved by psychological and educational means will depend largely upon the level of analysis accepted as representing intelligence. Training and structured learning can enhance achievement in the form of knowledge and skills. Traditional Intelligence Tests (IQ) are fairly broad samples of…

Discusses work by Arthur Jensen in addition to his well-known work on the genetics of intelligence. Includes studies of learning, memory, the cumulative-deficit hypothesis, Spearman's hypothesis, and the speed of information processing. (SLD)

This paper summarizes empirical findings of research on a theory of general mental ability, based on laboratory studies of the relationship between measurements of individual differences on conventional psychometric tests and in speed and efficiency of information processes. The paper covers characteristics of "g" (general mental ability),…

Chronometric methods of cognitive assessment of learning disabled students which measure speed of response to elementary cognitive tasks requiring minimal prior knowledge are discussed. Chronometric techniques known to correlate with IQ and other indexes of mental efficiency and scholastic proficiency are described. (Author/DB)

The performance on a battery of cognitive tests of an individual with extraordinary ability at mental arithmetic was studied. Implications of the rather ordinary test performance of Shakuntala Devi in contrast with her calculating speed are discussed with reference to memory and information processing. (SLD)

From Jensen's two-level theory of mental abilities it was predicted that forward digit span (FDS) should correlate less with IQ than backward digit span (BDS), and age and race should interact with FDS-BDS, with FDS-BDS difference decreasing as a function of age and a greater white-black difference in BDS than in FDS. (Author/BJG)

The effects of compensatory education programs in the United States during the past 20 years are discussed. The author believes the programs have had the least impact on scholastic achievement and intelligence quotient (IQ). The theoretical view of human intelligence and prevailing views of psychologists and educators of the 1960's regarding the…

This commentary on a paper by Douglas Detterman and others (EC 604 995), on assessing basic cognitive abilities in young adults with and without mental retardation, argues that variables measuring correct responding and variables measuring response latency or speed are two aspects of the same underlying continuum of speed and efficiency of…

Correlations among peripheral nerve conduction velocity (NCV), brain NCV, simple and choice reaction times, and a standard measure of intelligence were investigated for 200 male college students. No correlation was found between any arm NCV and the intelligence score. Neurophysiological bases of human information processing and intelligence are…

Notes that preschool compensatory education has not resulted in any appreciable, durable gains in I.Q. or scholastic achievement. Posits that compensatory programs remedied deficiencies in knowledge but not in cognitive processes. Suggests further research into the nature of intelligence and its malleability. (PGD)

Data are presented on body weight and cranial capacity for 211 young adult male Caucasians (postsecondary students). The data do not support Rushton's claim for a greater weight-adjusted cranial capacity of Mongoloid males. Speed and efficiency of cortical information processing may be more important for intelligence than brain size. (SLD)

This study examines the nature of the highly variable black-white difference across diverse tests and indicates the major systematic source of this between-population variation, namely, Spearman's g. Eleven large-scale studies (discussed in the appendix), each one comprising anywhere from 6 to 13 diverse tests, show a significant and substantial…

Information processing was measured in terms of reaction time and movement time to stimulus displays which differed in amount of information transmitted. Only reaction time increased as a linear function of number of bits in the stimulus display. Both show individual differences which significantly correlated with intelligence. (Author/RD)