Who is the early psychologist credited with founding psychophysics?

The early psychologist credited with founding psychophysics is Gustav Fechner. He is known for his pioneering work that established the relationship between physical stimuli and the sensations and perceptions they produce. Fechner's contributions include the formulation of laws that quantify how changes in stimulus intensity relate to changes in perception. His most notable work was the development of the Fechner's Law, which describes how the perceived intensity of a stimulus increases as a logarithm of the actual stimulus intensity. This foundational work laid the groundwork for future research in sensory psychology and the study of perception, making him a key historical figure in the field.