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Helmholtz's theory of color vision with Hering's theories

1. Name, compare, and contrast Helmholtz's theory of color vision with Hering's theory of color vision. In your discussion, explain which theory best explains color blindness and afterimages. Finally, compare and contrast monochromats, dichromats, and trichromats.

2. Identify the various stages of sleep and describe the physiological changes that accompany each stage. Also discuss the chronological sequencing and the timing of sleep stages throughout the night.

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1. Name, compare, and contrast Helmholtz's theory of color vision with Hering's theory of color vision. In your discussion, explain which theory best explains color blindness and afterimages. Finally, compare and contrast monochromats, dichromats, and trichromats.

Helmholtz's theory of color vision states that there are three sets of color-perceiving elements in the retina, red, green, and violet. Perception of the other colors arises from the combined stimulation of these elements.

Hering observed that the trichromatic theory could not explain the phenomenon of afterimages, negative-colored images seen after extended viewing of a colored object (e.g., red after green, or yellow after blue). Hering proposed that the visual system generated signals in opposing pairs (i.e., yellow-blue, red-green, white-black).

We now know that he was correct - the two theories simply reflect processes at different levels of visual processing.

Monochromats, dichromats, and trichromats refer to different capacity of photoreceptors in the eyes, to visualize one, two ...

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Helmholtz's theory of color vision with Hering's theory of color vision

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