The Visual System


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  • The Visual System

    1. 1. The Visual System
    2. 4. Sensory Adaptation <ul><li>Dark Adaptation </li></ul><ul><li>Light Adaptation </li></ul>
    3. 5. Vision and the Brain <ul><li>Primary Visual Cortex </li></ul><ul><li>a/k/a occipital lobe </li></ul>
    4. 6. Viewing the World in Color <ul><li>Purpose of color? </li></ul><ul><li>Subtractive color mixing (ex. Yellow and red makes orange) </li></ul><ul><li>Additive color mixing (ex. Shining lights on white surface) </li></ul><ul><li>Tricomatic Theory of color visison </li></ul><ul><ul><li>Color blindness </li></ul></ul><ul><li>Opponent process theory of color vision </li></ul>
    5. 7. Theories of Color Vision <ul><li>Trichomatic Theory-eye has receptors sensitive to red, blue and green and our eyes mix them to make others </li></ul><ul><li>Opponent Process Theory </li></ul><ul><li>Combination of both theories </li></ul>
    6. 8. Perceiving Forms, Patterns and Objects <ul><li>Reversible figure </li></ul>Perceptual Set-a readiness to perceive a stimulus in a particular way
    7. 9. Other Reversible Figures Necker Cube
    8. 10. Animated Necker Cube <ul><li> </li></ul>Reversible Sphere http:// Dancer
    9. 11. Feature Analysis-Assembling Forms <ul><li>Bottom-up processing – a progression from individual elements to the whole </li></ul><ul><li>Top-down processing - a progression from the whole to the elements </li></ul>
    10. 12. Gestalt Principles <ul><li>Phi Phenomenon-illusion of movement created by presenting visual stimuli in rapid succession </li></ul><ul><li>Ex. Movies and TV </li></ul>
    11. 13. Similarity <ul><li>When objects look similar to one another people often perceive them as a group or pattern. </li></ul>
    12. 14. Continuation <ul><li>When the eye is compelled to move through one object and continue to another object. </li></ul>
    13. 15. Closure <ul><li>When an object is incomplete or a space is not completely enclosed . If enough of the shape is indicated, people perceive the whole by filling in the missing information. </li></ul>
    14. 16. Proximity <ul><li>When elements are placed close together. They tend to be perceived as a group. </li></ul>
    15. 17. Figure and Ground <ul><li>The eye differentiates an object form its surrounding area. a form, silhouette, or shape is naturally perceived as figure (object), while the surrounding area is perceived as ground (background). </li></ul>
    16. 19. Assignment <ul><li>Power Point </li></ul><ul><li>9 Slides </li></ul><ul><li>Slide 1-Introduction </li></ul><ul><li>Slide 2-How do subliminal messages work? (what’s going on with vision and brain) </li></ul><ul><li>Slides 3,4,5 – Examples of subliminal messages </li></ul><ul><li>Slide 6-How do optical illusions work? You can focus on specific type, for ex., reversible figures </li></ul><ul><li>Slides 7,8,9 – Examples of optical illusions </li></ul>
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