CS 725/825 - Information Visualization
Fall 2013: Tues/Thurs 1:30-2:45pm, E&CS 2120

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Tableau's data visualization software is provided through the Tableau for Teaching program.

Homework 4: Visual Perception

Assigned: Tuesday, Sep 17, 2013
Due: Tuesday, Sep 24, 2013 before class begins

Written Assignment

  1. This question pertains to Christopher Healey's perception webpage (http://www.csc.ncsu.edu/faculty/healey/PP/), which was the source of much of the material from Ch 3 in our textbook.
    1. Experiment with the first Java applet (target detection of red circle). Describe the conditions when you could not find the red circle in 250ms. What if you increased the time to 1000 ms? Explain.
    2. Experiment with the second Java applet (boundary detection). Describe the conditions when you could not find the boundary in 250ms. What if you increased the time to 1000 ms? Explain.
  2. There are 10 examples of change blindness at http://www2.psych.ubc.ca/~rensink/flicker/download/index.html. Pick 5 of the examples that you have not seen before.
    1. Set a timer before you start looking at each image. What changed? How long did it take you to discover it?
    2. Once you discover the change, go back and look at each example again. Now, how long does it take you to notice each change? Why is there a difference?
  3. Find at least one example online (give the URL) of a visualization that employs a color scheme that breaks either the perceptual balance or distinguishability guidelines. Explain.
  4. Explain the implication of Stevens' Law for visualization
  5. Demonstrate the limitations of human processing by creating a visualization using your favorite tool that contains too many features to process visually. Include a screenshot and explain what is going on in the visualization. What is something you could do to help? Why might it work?

Grading Rubric: Rubric for Short Answer/Essay Questions

Submission: Submit a hard copy at the beginning of class.