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Questions and Answers
During dark adaptation, why does sensitivity increase as the visual system becomes dark adapted?
At what retinal eccentricity does rod density reach a peak, resulting in lowest thresholds and highest sensitivity?
In the classic dark adaptation study, why were stimuli presented on the temporal retina at 20-degree eccentricity?
What property describes the eye's ability to add up quanta over a certain area?
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Why is spatial summation critical diameter different for rods and cones?
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Which type of vision is dominant in the first few minutes of dark adaptation before the rods take over?
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What is dark adaptation?
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During dark adaptation, the first 5-10 minutes are primarily dominated by which type of vision?
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Where is the greatest sensitivity under photopic conditions?
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How long does it typically take for full dark adaptation to occur?
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What is the Stiles-Crawford effect related to?
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Spatial summation in the eyes refers to:
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What varies as the size (diameter) of a central stimulus increases?
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Why does the perceived size of an object change as we get closer to it?
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What can be easily calculated for circular spot stimuli in psychophysics experiments?
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In dark adaptation, what needs to be considered about stimulus size and retinal sensitivity?
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How can visual angle be calculated when knowing the absolute size and viewing distance?
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Why is measuring the area occupied by a stimulus useful in psychophysics?
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