Who is considered the originator of the IQ test?

Alfred Binet is recognized as the originator of the IQ test due to his pioneering work in the early 20th century. He, along with his colleague Théodore Simon, developed the first standardized intelligence test, known as the Binet-Simon scale, in 1905. This test was designed to identify children in need of educational assistance, laying the foundation for later methods of assessing cognitive abilities.

Binet's approach emphasized the importance of the environment and learning, moving away from the previously held notion that intelligence was fixed and innate. His work ultimately informed the modern IQ tests we use today, which aim to quantify intellectual capabilities relative to others within the same age group.

The other figures mentioned have made significant contributions to psychology but do not have a direct connection to the origins of the IQ test. Carl Rogers focused on humanistic psychology, emphasizing personal growth and self-actualization. Sigmund Freud is known for developing psychoanalysis and theories related to the unconscious mind, while Jean Piaget researched cognitive development in children, influencing educational psychology but not the measurement of intelligence through standardized tests.