Human Abilities and HCI: Vision and Perception
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Questions and Answers

What is the approximate decay time for information in the visual buffer?

  • 10-20 seconds
  • 70-1000 milliseconds (correct)
  • 5 minutes
  • 24 hours

    • The afterimage you see after staring at a bright light is a result of:

  • Short-term memory
  • The auditory buffer
  • The image in the visual buffer (correct)
  • Perceptual blindness

    • Perceptual buffers have limited capacity. What kind of search can be very fast in the visual buffer?

  • Serial search
  • Parallel search (correct)
  • Associative search
  • Sequential search

    • The Human Visual System is exceptionally fast and efficient at:

    <p>Visual pattern matching and object recognition</p> Signup and view all the answers

    Where is most of our ability to see details (acuity) concentrated in the retina?

    <p>In the fovea</p> Signup and view all the answers

    Which type of photoreceptors in the retina are responsible for detecting details and colors in good lighting?

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

    Cones are not effective in:

    <p>Low light</p> Signup and view all the answers

    Which type of photoreceptors detect light levels in very low light conditions, such as at night or in a dark room?

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

    How many types of cones are there in the eye?

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

    Which type of photoreceptors are responsible for night vision but are not sensitive to color?

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

    The distribution of cones is mostly dense in:

    <p>The fovea</p> Signup and view all the answers

    Which color are we less sensitive to due to the distribution of red and green cones?

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

    Color vision deficiency, also known as color blindness, primarily affects the ability to differentiate between which colors?

    <p>Red and green</p> Signup and view all the answers

    Which background color combinations can hurt the eyes and should be avoided?

    <p>Blue on red</p> Signup and view all the answers

    What can flashing or blinking at certain frequencies cause in some individuals?

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

    Why is blinking often used sparingly in user interfaces?

    <p>To attract attention without overstimulating</p> Signup and view all the answers

    How many people in the USA had some level of disability in 1997?

    <p>19.7%</p> Signup and view all the answers

    Which organization has developed usability and accessibility guidelines for the Internet?

    <p>W3C</p> Signup and view all the answers

    The Human Visual System is highly efficient at visual pattern matching and object recognition, especially when combined with:

    <p>Cognitive capabilities</p> Signup and view all the answers

    What is the approximate decay time for information in the auditory buffer?

    <p>0.9-3.5 seconds</p> Signup and view all the answers

    What is the central area of the retina where most of our ability to see details is concentrated?

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

    Which type of photoreceptors are sensitive to color and details in good lighting?

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

    In what lighting conditions do rods work best?

    <p>Low light</p> Signup and view all the answers

    What do cones primarily detect in very low light conditions?

    <p>Differences between light and dark</p> Signup and view all the answers

    How many types of cones are there in the human eye?

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

    What is the function of rods in the retina?

    <p>Detect light levels in very low light</p> Signup and view all the answers

    What is the implication of the distribution of cones in the retina?

    <p>Details are only seen near the current point of focus</p> Signup and view all the answers

    Which type of cones are more sensitive to blue and yellow shades?

    <p>Blue cones</p> Signup and view all the answers

    Which color backgrounds are generally soothing on the eyes?

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

    What is the most common form of color vision deficiency?

    <p>Red-green deficiency</p> Signup and view all the answers

    Which background colors are known to hurt the eyes when used together?

    <p>Green on red</p> Signup and view all the answers

    To minimize eye movement, UI design should:

    <p>Minimize constant eye movement</p> Signup and view all the answers

    What is the recommended way to design color palettes?

    <p>Use 4-6 colors per screen and avoid varying all color properties simultaneously</p> Signup and view all the answers

    What standard body defines and specifies HTML and CSS for the web?

    <p>W3C</p> Signup and view all the answers

    In the USA, what percentage of the population had a severe disability in 1997?

    <p>12.3%</p> Signup and view all the answers

    What is the main function of the Human Visual System?

    <p>Visual pattern matching and object recognition</p> Signup and view all the answers

    What is the afterimage you see after staring at a bright light?

    <p>An image in the visual buffer</p> Signup and view all the answers

    What part of the eye is concentrated with cones and is responsible for detecting details and color in good lighting?

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

    In which lighting conditions do rods work well?

    <p>Low light</p> Signup and view all the answers

    What does the distribution of cones imply for the field of vision?

    <p>Details are seen best near the current point of focus</p> Signup and view all the answers

    Which type of cones are the least sensitive to color?

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

    Which type of photoreceptors are sensitive to colors in good lighting?

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

    Which color combinations can hurt the eyes and should be avoided in UI design?

    <p>Green on red</p> Signup and view all the answers

    What is the purpose of blinking in UI design?

    <p>To attract attention without overstimulating</p> Signup and view all the answers

    What organization has developed accessibility guidelines for software applications and web-based information?

    <p>W3C</p> Signup and view all the answers

    What was the approximate number of people in the USA with some level of disability in 1997?

    <p>19.7%</p> Signup and view all the answers

    The Human Visual System is highly efficient at which of the following?

    <p>Visual pattern matching and object recognition</p> Signup and view all the answers

    In which buffer is information known to decay quickly, within 70-1000 milliseconds?

    <p>Visual buffer</p> Signup and view all the answers

    The highest concentration of photoreceptors in the retina is found in the:

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

    Which type of photoreceptors are sensitive to color and details in good lighting conditions?

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

    Which type of photoreceptors are responsible for detecting light levels in very low light conditions?

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

    How many types of cones are there in the human eye?

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

    What is the main function of cones?

    <p>Detect colors and details in good lighting</p> Signup and view all the answers

    What does the distribution of cones in the retina imply for color perception?

    <p>Details are only well seen near the current point of focus</p> Signup and view all the answers

    What type of photoreceptors are responsible for detecting light levels in very low light conditions, such as at night or in a dark room?

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

    Which part of the eye is concentrated with cones and is responsible for detecting details and color in good lighting?

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

    What is one implication of having more red and green cones than blue cones?

    <p>Blue lines are used for exercise books</p> Signup and view all the answers

    Which background colors are known to hurt the eyes when used together?

    <p>Green on red</p> Signup and view all the answers

    To minimize eye movement in UI design, what is recommended?

    <p>Minimize constant eye movement</p> Signup and view all the answers

    What should be the main objective when designing color palettes for UI?

    <p>Use 4-6 colors per screen and avoid varying all color properties simultaneously</p> Signup and view all the answers

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