Hering Theory of Color Vision

Ewald Hering, a German physiologist, proposed a unique theory of color vision that went beyond trivariance in its insights into how the nervous system compares cone signals to perceive color. He proposed the existence of antagonism between certain pairs of colors, such as blue and yellow and red and green. The brain could not perceive a blue-yellow or a red-green color, whereas it could perceive red-yellow, green-yellow, red-blue, or green-blue colors. Blue and yellow cancel each other so that one cannot perceive bluish-yellow. Similarly, red and green cancel each other so that one cannot perceive reddish-green. This cancellation of one color impression by another was thought to represent neural antagonism. This was a major insight into how the brain compares the three cones in two pairs in order to perceive color.

Hering's theory was based on subjective experience. The discovery of antagonism between cone responses in single neurons of fish retina led to a renaissance of his theory. Linking the physiology of retinal neurons with subjective colors has proven to be difficult, however. The major reason for the difficulty is that color does not appear to be determined at the retinal or geniculate level but depends on additional operations that occur in visual cortex. Antagonism between cones, which occurs in the retina, is not equivalent to antagonism between colors, which occurs in the cortex.

Understanding And Treating Autism

Understanding And Treating Autism

Whenever a doctor informs the parents that their child is suffering with Autism, the first & foremost question that is thrown over him is - How did it happen? How did my child get this disease? Well, there is no definite answer to what are the exact causes of Autism.

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