PSYCH 1XX3 Lecture Notes - Color Vision, Color Constancy, Ewald Hering
17 Mar 2014
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), and blue (short) wavelengths of light: young-helmholtz theory wavelength receptors, but weakly activate the other receptors, giving rise to the perception of blue. Similar to the antagonistic center-surround receptive field organization of the retina, these opponent channels would respond in opposing directions to pairs of colours. One set of neurons encodes black-white differences, corresponding to the intensity/luminance differences in the field. Another set responds to red and green colour differences. A third set responds to yellow and blue colour differences. In the retina, we can think of these channels with the perspective of the retinal ganglion cell receptive field organization. A blue-yellow cell would signal +b-y/+y-b there are no yellow cones so yellow channels are made up of the responsive properties of med (green) and long (red) wavelength sensitive cones. We perceive colour when there is a relative diff in the activity that is biased towards one of the colour cells.
