Louis L. Thurstone (Louis Leon Thurstone)

Louis L. Thurstone was an influential American psychologist known for his work in understanding how people perceive and compare things. He developed methods to measure attitudes and intelligence, emphasizing that mental abilities are made up of multiple distinct factors rather than a single general ability. Thurstone introduced techniques like the "statistical scale" to analyze complex data reliably. His research helped improve psychological testing and our understanding of human thought processes, making him a key figure in the field of psychometrics and psychological measurement.