Answer:
His experiments established a link between our senses and perception
Explanation:
Hermann von Helmholtz was a sensory physiologist who carried out researches on depth perception, motion perception and vision. He also carried out research in hearing which established our perception of sound and music.
Psychology is the study of the mind and its behavior. Largely, the function of the mind is attached to our perception of external stimuli received by the body from its environment. The eyes and the ears being a major source of information that the mind responds to, studies by Hermann von Helmholtz gave an understanding to the role of the eyes and ears as well as the varying levels of stimuli that produce specific results in the human behaviour
These results, provided answers to the reasons for thoughts and responses attached to music and visual perception.