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Related Experiment Videos

Finger width corrections in Fitts' law: implications for speed-accuracy research.

E R Hoffmann1, I H Sheikh

  • 1Department of Mechanical and Manufacturing Engineering, University of Melbourne, Parkerville, Victoria 3052, Australia.

Journal of Motor Behavior
|December 1, 1991
PubMed
Summary
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Using a finger in Fitts tasks can skew results. Correcting for finger pad width is crucial for accurate information processing rate measurements, especially in developmental studies.

Area of Science:

  • Human-Computer Interaction
  • Cognitive Psychology
  • Motor Control

Background:

  • Fitts' task is a widely used paradigm to study human motor control and performance.
  • The standard Fitts' task assumes a point-like probe, but real-world interaction often uses larger probes like the finger pad.
  • This discrepancy can introduce systematic errors in performance metrics.

Purpose of the Study:

  • To highlight the potential for misleading results when using the finger as a probe in Fitts' tasks.
  • To demonstrate the necessity of correcting for finger pad width in calculating the index of difficulty.
  • To illustrate the impact of this correction on information processing rate calculations, particularly in developmental contexts.

Main Methods:

  • Experimental manipulation of target width and finger pad size.

Related Experiment Videos

  • Application of Fitts' law with and without target width correction.
  • Analysis of information processing rates across different age groups in a developmental study.

    • Main Results:

    • Using the finger pad as a probe significantly increases target tolerance.
    • Failure to correct for finger pad width leads to overestimation of information processing rates.
    • The magnitude of this overestimation varies with age due to changes in finger pad size.

    Conclusions:

    • The finger pad width must be incorporated into Fitts' task analysis for accurate performance assessment.
    • This correction is particularly important in developmental research where anthropometric measures change.
    • Accurate measurement of information processing is vital for understanding motor development and optimizing human-computer interaction.