Toward Goldilocks' pointing device: determining a "just right" gain setting for users with physical impairments

  • Authors:
  • Heidi Horstmann Koester;Edmund LoPresti;Richard C. Simpson

  • Affiliations:
  • Koester Performance Research, Ann Arbor, MI;Koester Performance Research, Ann Arbor, MI;VA Pittsburgh Healthcare System, Pittsburgh, PA

  • Venue:
  • Proceedings of the 7th international ACM SIGACCESS conference on Computers and accessibility
  • Year:
  • 2005

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Abstract

We designed and evaluated an agent that recommends a pointing device gain for a given user, with mixed success. 12 participants with physical impairments used the Input Device Agent (IDA), to determine a recommended gain based on their performance over a series of target acquisition trials. IDA recommended a gain other than the Windows default for 9 of 12 subjects. Subsequent performance using the IDA gain showed no meaningful differences as compared to the default setting or users' pre-study settings. Across all gains used by these subjects, however, gain did have a significant effect on throughput, percent of error-free trials, cursor entries, and overshoot. Linear models of gain's effect on performance showed that its effect on throughput is relatively small, with only a 13% difference from highest throughput (at gain = 10) to lowest throughput (at gain = 6). Cursor entries were more strongly affected, showing a steady increase with increasing gain.