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Method for enhancing text entry rate with single-switch scanning

A method to tailor single-switch scanning interfaces for users with physical impairments, increasing text entry rates by adjusting settings such as switch type, scan delay, and prediction system with promising results. Participants experienced an average 120% improvement in text entry rates, showing great potential for enhancing communication for individuals using single-switch scanning methods.

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Method for enhancing text entry rate with single-switch scanning

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  1. Method for enhancing text entry rate with single-switch scanning Heidi Horstmann Koester, PhD; Richard Callaghan Simpson, PhD, ATP

  2. Aim • Establish an effective and efficient process for tailoring a scanning interface to a particular user. • Relevance • Single-switch scanning is a technique used by some individuals with severe physical impairments for spoken and/or written communication. • While single-switch scanning allows people who may be unable to speak to communicate, it is a slow method of text entry.

  3. Method • Developed method for adjusting settings in single-switch scanning interface to increase user’s text entry rate. • Evaluated method with 9 individuals. • Adjustments included: • Revising switch type or location. • Changing scan delay. • Altering letter layout. • Changing word or letter prediction system.

  4. Results • Text entry rates improved by average of 120%. • All 9 subjects increased text entry rate by ≥40%. • 5 increased text entry rate by >100%. • At baseline, text entry rate averaged 1.42 words per minute. • With revised settings, text entry rate averaged 2.72 words per minute.

  5. Conclusion • Results for this approach show great potential for enhancing text entry rate achieved by single-switch scanning users. • By more than doubling their text entry rate, on average, participants gained significant function by using revised settings identified using our procedure. • We look forward to continued work in this area.

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