Visual Perception and Stimulus Size Quiz
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Visual Perception and Stimulus Size Quiz

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Questions and Answers

During dark adaptation, why does sensitivity increase as the visual system becomes dark adapted?

  • Due to the rod cells becoming more sensitive (correct)
  • Due to a change in cone dominance
  • Due to an increase in luminance
  • Due to a decrease in rod density
  • At what retinal eccentricity does rod density reach a peak, resulting in lowest thresholds and highest sensitivity?

  • 15-degree retinal eccentricity
  • 18-degree retinal eccentricity (correct)
  • 10-degree retinal eccentricity
  • 5-degree retinal eccentricity
  • In the classic dark adaptation study, why were stimuli presented on the temporal retina at 20-degree eccentricity?

  • To test cone dominance
  • To measure spatial summation
  • To avoid the blind spot (correct)
  • To maximize rod sensitivity
  • What property describes the eye's ability to add up quanta over a certain area?

    <p>Spatial summation</p> Signup and view all the answers

    Why is spatial summation critical diameter different for rods and cones?

    <p>Rods and cones have different receptive fields</p> Signup and view all the answers

    Which type of vision is dominant in the first few minutes of dark adaptation before the rods take over?

    <p>Photopic vision</p> Signup and view all the answers

    What is dark adaptation?

    <p>The process of the visual system adjusting to low light after being in high light levels.</p> Signup and view all the answers

    During dark adaptation, the first 5-10 minutes are primarily dominated by which type of vision?

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

    Where is the greatest sensitivity under photopic conditions?

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

    How long does it typically take for full dark adaptation to occur?

    <p>40 minutes</p> Signup and view all the answers

    What is the Stiles-Crawford effect related to?

    <p>Effect of light rays angle on cone brightness perception</p> Signup and view all the answers

    Spatial summation in the eyes refers to:

    <p>The eyes' capability to summate or add up quanta over an area.</p> Signup and view all the answers

    What varies as the size (diameter) of a central stimulus increases?

    <p>Proportion of cones and rods stimulated</p> Signup and view all the answers

    Why does the perceived size of an object change as we get closer to it?

    <p>Due to the principles of simple trigonometry</p> Signup and view all the answers

    What can be easily calculated for circular spot stimuli in psychophysics experiments?

    <p>Area by measuring diameter</p> Signup and view all the answers

    In dark adaptation, what needs to be considered about stimulus size and retinal sensitivity?

    <p>Measuring size in x and y dimensions</p> Signup and view all the answers

    How can visual angle be calculated when knowing the absolute size and viewing distance?

    <p>$\theta = \arctan (h/d)$</p> Signup and view all the answers

    Why is measuring the area occupied by a stimulus useful in psychophysics?

    <p>To estimate perceived size accurately</p> Signup and view all the answers

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