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Sterovision

Discover how the brain processes images from the retinas to enable stereovision, using retinal disparity to gauge distance. Learn about convergence, disparity, and the role of neurons in the visual cortex.

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Sterovision

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Presentation Transcript

  1. How do we see in 3 dimensions? Sterovision

  2. Retinal Disparity • Objects that are far or near project slightly different images on our retinas. • This creates “retinal disparity”, which provides clues to distance.

  3. To Achieve Stereovision, Our Eyes Must Converge on a Point Convergence point Zero disparity Negative disparity Positive disparity

  4. The Convergence Point and Disparity Positive disparity Convergence point Zero disparity Negative disparity

  5. How does the brain process the images from the two retinas?

  6. Visual aferences

  7. Ocular Dominance Columns Orientation specificity Eye specificity

  8. Ocularity of Neurons in V1 • Monocular neurons respond to the activity of one eye, either the right eye or the left eye. • Binocular neurons respond to the simultaneous activity of both eyes.

  9. Monocular Neurons Activated by one eye only Example is left eye monocular neuron LGN LGN Active when left eye is stimulated Inactive

  10. Binocular Neurons Stimulating only one eye is not sufficient to activate LGN LGN Inactive Inactive

  11. Binocular neuron Activated only when both eyes are stimulated LGN Active!

  12. The right and left eyes project to different adjacent regions of the visual cortex: Ocular dominance columns

  13. Formation of Ocular Dominance Depends on Activity Visual Cortex Left eye closed Right Left

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