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Transduction

Transduction. How is this important when studying sensation?. Stimulus energies to neural impulses. For example: Light energy to vision. Chemical energy to smell and taste. Sound waves to sound. Conversion of one form of energy to another. Vision. We only use light energy to see.

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Transduction

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  1. Transduction How is this important when studying sensation? Stimulus energies to neural impulses. For example: Light energy to vision. Chemical energy to smell and taste. Sound waves to sound. Conversion of one form of energy to another.

  2. Vision

  3. We only use light energy to see.

  4. What makes up a light wave?

  5. Wavelength • The distance from the peak of one light wave to the peak of the next. • The distance determines the hue (color) of the light we perceive.

  6. Intensity The amount of energy in a light wave. Determined by the height of the wave. The higher the wave the more intense the light is.

  7. Structure of the Eye

  8. Nearsighted Vision

  9. Farsighted Vision

  10. The Retina

  11. Feature Detection The concept that specific nerve cells in the brain respond to specific features of the stimulus, such as shape angle or movement.

  12. Parallel Processing • The processing of several aspects of a problem simultaneously. Motion Form Color Depth

  13. How do we see in color? What color is this dragon?

  14. Color • The dragon is anything but red. • The dragon rejects the long wavelengths of light that to us are red- so red is reflected of and we see it. • Also, light has no real color. • It is our mind that perceives the color.

  15. Two major color theories

  16. Young-Helmholtz Trichromatic (three color) Theory • Realized that any color can be created by combining the light waves of three primary color- RED GREEN BLUE • So they guessed that we have 3 different types of receptor cells in our eyes. Together they can pick any combination of our 7 million color variations. • Most colorblind people simply lack cone receptor cells for one or more of these primary colors.

  17. Opponent-Process Theory • We cannot see certain colors together in combination (red-green, blue-yellow, and white-black). These are antagonist/ opponent colors. Tube and marble example.

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