Mental Chronometry (MC) comprises a variety of techniques for measuring the speed with
which the brain processes information. First developed in mid-1800, MC was subsequently
eclipsed by more complex and practically useful types of psychometric tests stemming from …

What is it about human brains that make some people more capable than others? In an
authoritative and critical account, Professor Ian Dreary reviews historical, cognitive, and
biological research on the foundations of human mental ability. Where most previous …

It is widely believed that human brain size and intelligence are only weakly related to each
other. Using magnetic resonance imaging, we show that larger brain size (corrected for body
size) is associated with higher IQ in 40 college students equally divided by high versus …

“(An) incendiary thesis.... that separate races of human beings evolved different reproductive
strategies to cope with different environments and that these strategies led to physical
differences in brain size and hence in intelligence. Human beings who evolved in the warm …

In this study, we hypothesize that the worldwide distribution of cognitive ability is determined
in part by variation in the intensity of infectious diseases. From an energetics standpoint, a
developing human will have difficulty building a brain and fighting off infectious diseases at …

The human brain is one of the most intricate, complicated, and impressive organs ever to
have evolved. Understanding its evolution requires integrating knowledge from a variety of
disciplines in the natural and social sciences. Four areas of research are particularly …

General intelligence (g) poses a problem for evolutionary psychology's modular view of the
human brain. The author advances a new evolutionary psychological theory of the evolution
of general intelligence and argues that general intelligence evolved as a domain-specific …

Just as body symmetry reveals developmental stability at the morphological level, general
intelligence may reveal developmental stability at the level of brain development and
cognitive functioning. These two forms of developmental stability may overlap by tapping …

The origin of values and preferences is an unresolved theoretical question in behavioral and
social sciences. The Savanna-IQ Interaction Hypothesis, derived from the Savanna Principle
and a theory of the evolution of general intelligence, suggests that more intelligent …

Individual differences in the trial-to-trial variability of reaction time (RT), indexed by the
standard deviation of the individual's RTs over n trials (RTSD), generally has a larger
negative correlation with psychometric g than does the median RT (RTmd) over n trials …