Afterimage

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  • The term used for residual images perceived after staring at an image for about 30 seconds and then switching to a white space. The color black (in the original picture) will result in a white afterimage, while green will result in red and yellow will result in blue. Afterimages are explained by the structure of ganglion cells and their photoreceptors. The center-surround receptive fields of ganglion cells form the basis for opponent colors. Some ganglion cells have a center that responds best to green wavelengths and a surround whose photoreceptors respond best to red, while other ganglion cells pair blue and yellow, or black and white (as the main types). When either the center or the surround of a ganglion cell's receptive field is stimulated, ...

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