Understanding the Blind Spot and Visual Receptors
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Questions and Answers

What is the main reason you never notice your blind spot in everyday life?

  • Your brain fills in the gap (correct)
  • The blind spot is too small to notice
  • The blind spot only affects one eye
  • The blind spot is visible to both eyes
  • Which type of receptors are abundant in the periphery of the human retina and respond to faint light?

  • Rods (correct)
  • Ultraviolet receptors
  • Cones
  • Violet receptors
  • In what type of light are cones less active?

  • Dim light (correct)
  • Ultraviolet light
  • Infrared light
  • Bright light
  • Which wavelengths are perceived as blue and green in visible light?

    <p>Shortest wavelengths</p> Signup and view all the answers

    According to the Trichromatic Theory, how many receptor types do people have to distinguish various colors?

    <p>Three</p> Signup and view all the answers

    What is the main characteristic of cones in the human retina?

    <p>Essential for color vision</p> Signup and view all the answers

    What is the pathway of messages from the receptors in the vertebrate retina to the brain?

    <p>Receptors -&gt; Bipolar cells -&gt; Ganglion cells -&gt; Brain</p> Signup and view all the answers

    Which type of cells in the retina refine the input to ganglion cells, enabling them to respond mainly to particular visual features?

    <p>Amacrine cells</p> Signup and view all the answers

    What is the role of ganglion cells in the retina?

    <p>Receive messages from the receptors</p> Signup and view all the answers

    Why is the point where the optic nerve exits the eye referred to as the blind spot?

    <p>It has no receptors</p> Signup and view all the answers

    Which cells enable certain ganglion cells to respond mainly to particular shapes, directions of movement, and color in the visual field?

    <p>Amacrine cells</p> Signup and view all the answers

    What anatomical feature allows light to pass through the ganglion, amacrine, and bipolar cells in the eye without distortion?

    <p>The transparent nature of these cells</p> Signup and view all the answers

    What did Thomas Young contribute to our understanding of color vision?

    <p>He proposed the Trichromatic Theory of color vision.</p> Signup and view all the answers

    According to the Trichromatic Theory, why do we perceive color?

    <p>Through responses across a few types of receptors sensitive to different wavelengths.</p> Signup and view all the answers

    Why did Helmholtz conclude that three kinds of receptors are sufficient for human color vision?

    <p>Since people could match any color by mixing only three wavelengths.</p> Signup and view all the answers

    What is the significance of the term 'Trichromatic' in the Young-Helmholtz Theory?

    <p>It describes the three types of cones sensitive to different wavelengths.</p> Signup and view all the answers

    Why did Herman von Helmholtz modify Thomas Young's Trichromatic Theory?

    <p>To improve the theory's explanation regarding human ability to see color.</p> Signup and view all the answers

    In the Trichromatic Theory, how do we discriminate among wavelengths?

    <p>Through the ratio of activity across different types of cones.</p> Signup and view all the answers

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