Zur vergleichenden Physiologie des Gesichtssinnes…

The work "Zur vergleichenden Physiologie des Gesichtssinnes" (Comparative Physiology of the Visual Sense) was published in 1826 by Johannes Müller, a German physiologist and comparative anatomist. This publication brought Müller recognition for its extensive new material on human and animal vision, including analyses of human expressions and research on insect and crustacean eyes.1

Müller's significant contribution was the discovery that each sense organ responds to stimuli in its own unique way, a concept known as the "specific energy" of sense organs. This means that the phenomena of the external world are perceived based on how they alter our sensory systems. His findings also influenced the theory of knowledge. Additionally, Müller explored optical illusions and visual estimates, noting that distinct differences appear larger than vaguely perceived ones. He also investigated how eye movements influence the estimation of length.123