Who first proposed the opponent-process theory of color vision?

Question

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The opponent-process theory of color vision was first proposed by Ewald Hering in the early 20th century, building on the work of previous theorists such as Thomas Young and Hermann von Helmholtz. Hering suggested that color vision is based on three pairs of opponent color processes: red versus green, blue versus yellow, and black versus white. This theory has been influential in the field of color vision research and continues to be studied today.

Who First Proposed the Opponent-Process Theory of Color Vision