8A. Senses Working Overtime: Vision

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12 Terms

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Phototransduction

Receiving light energy and transforming it into neural messages that are then processed.

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Part of the eye

  • Retina

    • Cones

    • Rods

  • Cornea

  • Lens

  • Pupil

  • Iris

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Retina

Receives light via photoreceptors.

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Cones

Photoreceptors that receive color.

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Rods

Photoreceptors that detect motion.

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Cornea

The protective covering of the eye.

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Lens

Focuses light.

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Pupil

The opening that lets light into the eye.

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Iris

“Colored” muscle that constricts and dilates the pupil.

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Theories of Color Processing

  • Trichromatic Theory

  • Opponent-Process Theory

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Trichromatic Theory

People process light as combinations of red, blue, and green.

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Opponent-Process Theory

People process light as combinations of black & white, red & green, and blue & yellow.