Gestural Bimanual Input

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Gestural / Bimanual Input

• Scott Klemmer
• 29 November 2005

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Final project papers presentations

• Final papers 4 pages in the traditional CHI
  format or 6 pages in the work-in-progress format
  (same effective length, I suggest the latter as
  you can submit it to CHI WIP)
• Final presentations 4 minutes each, followed by
  posters/demos
• There will be outside reviewers, also folks from
  industry will be coming

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How to write a good paper

• Have a clear hypothesis
• Explain design ideas, system, and eval
• Read your critiques of earlier work
• Compare your results to 4-5 pieces of related
  work
• scholar.google.com is a great resource

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Milestone 2 demo times

• 130 - Deepak Kumar and David Tu
• 140 - David Akers
• 150 - Luping May, Kevin Collins, Scott Doorley
• 200 - Malte F. Jung, Howard Kao, Ravi Teja
  Tiruvury, Parul Vora
• 210 - Becky Currano and Murad Akhter
• 220 - Christina Chan
• 230 - Tom Hurlbutt
• 240 - Dhyanesh Narayanan
• 250 - BREAK
• 300 - Dean Eckles, Tony Tulathimutte, Tanya
  Breshears
• 310 - Jonathan Effrat and May Tan
• 320 - Shailendra Rao and Abhay Sukumaran
• 330 - Adam Kahn and Doug Wightman
• 340 - Brandon Burr
• 350 - Angela Kessell and Chris Chan

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Pointing Device Evaluation

• Experimental task target acquisition
• abstract, elementary, essential

• Real task interacting with GUIs
• pointing is fundamental

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Fitts Law (Paul Fitts, 1954)
Task difficulty is analogous to information -
execution interpreted as human rate of
information processing
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50 years of data
Reference MacKenzie, I. Fitts Law as a research
and design tool in human computer interaction.
Human Computer Interaction, 1992, Vol. 7, pp.
91-139
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What does Fitts law really model?
Target Width
Velocity
(c)
(a)
(b)
Distance
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Using these laws to predict performance

• Which will be faster on average?
• pie menu (bigger targets less distance)?

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Beyond pointing Trajectory based tasks
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Gaming Fitts Law

• The Macintosh menu bar and taskbar and the
  Windows XP Taskbar have infinite height
  improving their Fitts Law performance
• as does the back button in the Firefox browser

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Yves Guiard Kinematic Chain

• Asymmetry in bimanual activities
• Under standard conditions, the spontaneous
  writing speed of adults is reduced by some 20
  when instructions prevent the non-preferred hand
  from manipulating the page
• Non-dominant hand (NDH) provides a frame of
  reference for the dominant hand (DH)
• NDH operates at a course temporal and spatial
  scale DH operates at a fine temporal and spatial
  scale