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Various theories

Various theories . Sensation and perception. Opponent-Process theory –. Developed by Ewald Hering There are some color combinations that we never see Such as reddish-green Yellowish-blue These colors oppose each other We DO see – yellowish greens, bluish reds, yellowish reds.

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Various theories

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  1. Various theories Sensation and perception

  2. Opponent-Process theory – • Developed by EwaldHering • There are some color combinations that we never see • Such as reddish-green • Yellowish-blue These colors oppose each other We DO see – yellowish greens, bluish reds, yellowish reds

  3. Opponent theory cont… • Hering also observed that there was a distinct pattern to the color of the after images we see. • For example if one looks at a unique red patch for about a minute and then switches the gaze to a white area they will see a greenish patch in the white area.

  4. Trichromatic Theory of Color Vision • Created by Thomas Young and Hermann von Helmholtz • Proposed that color vision results for the actions of three different receptors • One receptor is sensitive to the color green, another to the color blue, and a third to the color red. These three colors can then be combined to form any visible color in the spectrum.

  5. Trichromatic theory cont… • It is possible to match all of the colors in the visible spectrum by appropriate mixing of three primary colors • Doesn’t necessarily matter which primary colors are used as long as the mixing of the 2 doesn’t produce the third.

  6. Frequency Theory • claims that human beings do not actually experience sound waves themselves, but rather vibrations on the auditory nerve, the frequencies of which are identical to the frequencies of the sound waves coming into the ear. How we hear sounds (soundwaves) • Sound is picked up by the outer ear (acoustics) • Then travels to the middle ear through the eardrum • Sound increases in dB to the inner ear (cochlea) • Sound/pulses that travel up the auditory nerve, carrying the information about sound to the brain for processing

  7. Cont… • the rate of this pulse matched the frequency of whatever tone you are hearing exactly. • We hear the tone because the pulse traveling up the auditory nerve matches the actual tone. • Essentially, we are getting a copy of the real sound.

  8. Volley Theory • Extension of the frequency theory • proposes that when peaks in a sound wave come too frequently for a single neuron to fire at each peak, several neurons fire as a group at the frequency of the tone • Car engine, jet engine, etc.

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