When1: 1878
Who: Ewald Hering [Hering, Ewald]
What: physiologist
Where: Austria
works\ Theory of Light Sensing [1878]
Detail: He lived 1834 to 1918. Lung receptors signal distension, stop inspiration {Hering-Breuer reflex}, and partly control respiration.
He explained brightness perception, color vision, afterimages, and complementary colors by starting from neutral point and moving in anabolic or catabolic direction {opponent color theory, Hering}. Yellow does not subjectively appear to mix green and red and is stable over intensity changes, so yellow is a primary-color complement. Eye-movement, color-detection, and brightness-detection mechanisms are inborn. People see unique blue, unique green, and unique yellow, because they affect all three cones and, at that wavelength, people perceive no other color mixed in. People do not see unique red, because only two cones affect red.
Brain substance can contain memories, and memory is a material process, because memory survives unconsciousness and sleep.
Biological Sciences>Biology>History>Sensation
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Date Modified: 2022.0224