CSE440 Lecture 07: Human Performance in HCI
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Questions and Answers

What is the main purpose of creating models in the context of human performance?

  • To capture essential pieces and allow a closer look at phenomena (correct)
  • To underfit the model by excluding essential components for simplicity
  • To limit the model to only what it needs, without any additional components
  • To overfit the model with unnecessary components for a detailed analysis

    • Which approach is described as a fundamentally inductive process from specific observations to broader generalizations?

  • Collect Data, Draw Analogies, Test Predictions, Observe, Find Patterns, Devise Model, Test Fit to Data, Revise
  • Observe, Collect Data, Find Patterns, Draw Analogies, Devise Model, Test Fit to Data, Test Predictions, Revise (correct)
  • Draw Analogies, Observe, Collect Data, Test Fit to Data, Test Predictions, Revise, Devise Model, Find Patterns
  • Find Patterns, Test Fit to Data, Devise Model, Observe, Test Predictions, Draw Analogies, Collect Data, Revise

    • How is light processed in the human visual system?

  • It is captured by the optic nerves and then focused on the retina before being processed in the brain
  • It directly goes to the brain for processing without being focused on the retina
  • It passes through the lens and is focused on the retina before being processed in the brain (correct)
  • It is captured by the retina and directly sent to the brain for processing

    • Why is it important to avoid underfitting or overfitting a model?

    <p>To prevent excessive complexity or omission of essential components in the model</p> Signup and view all the answers

    Which principle involves the idea that people tend to perceive objects as part of a greater whole and ascribe meaning to them?

    <p>Gestalt Principles</p> Signup and view all the answers

    In terms of models of human performance, what does 'by analogy' refer to?

    <p>Designing models using similarities between known and unknown phenomena</p> Signup and view all the answers

    Which type of light-sensitive receptors in the retina are primarily for night vision and perceiving movement?

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

    What is the main function of cones in the retina?

    <p>Sense color</p> Signup and view all the answers

    What is the distribution of photopigments like in the retina?

    <p>Mainly reds (64%), very few blues (4%)</p> Signup and view all the answers

    What does the equation Y = 0.3 Red + 0.59 Green + 0.11 Blue represent?

    <p>Calculation of grayscales and balanced colors</p> Signup and view all the answers

    What makes saturated colors (i.e., pure colors) more challenging for the eye in terms of focusing?

    <p>They are focused at different distances behind the eye's lens</p> Signup and view all the answers

    What do we primarily use for detecting edges and shapes?

    <p>Brightness and color difference</p> Signup and view all the answers

    Why is it challenging to detect blue edges and shapes?

    <p>They are hard to detect due to low sensitivity in the retina</p> Signup and view all the answers

    What happens to the lens with age that affects sensitivity to blue light?

    <p>It absorbs short wavelengths, reducing sensitivity to blue light</p> Signup and view all the answers

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