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