mental ability

Human intelligence, in psychology, is studied through various theories, including psychometric, cognitive, cognitivism and contextualism, and biological approaches. Psychometric theories focus on the structure of intelligence, often using tests with analogies, classifications, and series completions to measure abilities like reasoning and memory. Early theories, like Charles Spearman's, proposed a general factor (g) underlying all intelligent performance, while others, such as L.L. Thurstone's, identified multiple primary mental abilities.12

Cognitive theories delve into the mental processes involved in intelligence, such as perception, learning, and memory. These approaches examine how information is represented and processed, with researchers measuring the speed of thinking and breaking down tasks into constituent mental processes. The concept of mental age, where an individual's performance is compared to average levels for specific chronological ages, was an early method of measuring intelligence, though it has largely fallen out of favor. Environmental factors and cultural contexts also play a significant role in shaping how intelligence is understood and expressed.1345