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Expert chording text entry on the Twiddler one-handed keyboard

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3 Author(s)
Lyons, K. ; Coll. of Comput., Georgia Inst. of Technol., Atlanta, GA, USA ; Plaisted, D. ; Starner, T.

Previously we demonstrated that after 400 minutes of practice, ten novices averaged over 26 words per minute (wpm) for text entry on the Twiddler one-handed chording keyboard, outperforming the multitap mobile text entry standard. We present a study that examines expert chording performance. Our five participants achieved an average rate of 47 wpm after approximately 25 hours of practice in varying conditions. One subject achieved a rate of 67 wpm, equivalent to the typing rate of the last author who has been a Twiddler user for ten years. We analyze the effects of learning on various aspects of chording, provide evidence that lack of visual feedback does not hinder expert typing speed and examine the potential use of multicharacter chords (MCCs) to increase text entry speed.

Published in:

Wearable Computers, 2004. ISWC 2004. Eighth International Symposium on  (Volume:1 )

Date of Conference:

31 Oct.-3 Nov. 2004

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