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Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
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Defining thumb reach envelopes for handheld devices.

Edward W Otten1, Keith S Karn, Kelley S Parsons

  • 1Research and Engineering Development, LLC, 48015-1 Pine Hill Run Road, Lexington Park, MD 20653, USA. ottenew@gmail.com

Human Factors
|March 23, 2013
PubMed
Summary

This study provides novel 2D thumb reach envelopes for designing handheld devices. The findings offer practical data for human factors professionals to optimize control placement for diverse user groups.

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Area of Science:

  • Human-Computer Interaction
  • Ergonomics
  • Product Design

Background:

  • Increasing use of handheld devices necessitates better control placement guidelines.
  • Existing research lacks adequate 2D thumb reach envelopes for primary control surfaces.

Purpose of the Study:

  • To present 2D thumb reach envelopes for handheld device control placement.
  • To introduce methods for gathering and analyzing thumb reach data.

Main Methods:

  • 90 participants (adolescent females, young mothers, young fathers) placed control representations.
  • Participants painted their thumb reach envelopes on a touch-screen device.

Main Results:

  • Presents novel 2D thumb reach envelopes for handheld device control surfaces.
  • Adolescent females exhibit a slightly larger, more circular primary reach zone.
  • Preferred control locations align well with the derived thumb reach zones.

Conclusions:

  • The presented thumb reach envelopes are the first of their kind and valuable for human factors professionals.
  • The data collection method is efficient, inexpensive, and adaptable for various user populations and device dimensions.