Anson Denis, Moist Penni, Przywara Mary, Wells Heather, Saylor Heather, Maxime Hantz
College Misericordia, Dallas, Pennsylvania 18612, USA.
Assist Technol. 2006 Fall;18(2):146-54. doi: 10.1080/10400435.2006.10131913.
Word prediction is often recommended by therapists as a means to improve typing speed for clients with physical limitations. Although literature suggests that word prediction does have an effect on writing proficiency, increased speed is not one of its benefits when used with a standard keyboard. One reason given for the failure of word prediction to accelerate typing is that the user must look away from any source document to scan the prediction list during typing. Looking away from the source document may slow the typist more than any acceleration offered by word prediction. For input methods that already require the typist to look away from the copy, this effect might be irrelevant. The focus of this research was to determine whether word completion or word prediction programs would increase typing speed when used with an input method (an on-screen keyboard) that also requires looking away from the source document. Ten people, five men and five women, aged 20 to 38 years, participated in this study. The study used a single-subject, successive intervention design to test typing speed and accuracy using an on-screen keyboard with integrated word prediction software. Seven participants had their fastest typing speed with word prediction. Two participants had their fastest typing speed with word completion. Only one participant demonstrated no improvement in speed when using these two programs. Overall, these results show that the use of word prediction and word completion may assist on-screen keyboard users to improve typing speed.
治疗师经常推荐使用单词预测功能，作为提高身体有残疾的客户打字速度的一种方法。尽管文献表明单词预测功能确实对写作熟练度有影响，但在使用标准键盘时，提高打字速度并不是它的优点之一。单词预测功能未能加快打字速度的一个原因是，用户在打字时必须将视线从任何源文档上移开，去浏览预测列表。将视线从源文档上移开，可能比单词预测功能带来的任何速度提升更能减慢打字员的速度。对于那些已经要求打字员将视线从副本上移开的输入方法来说，这种影响可能无关紧要。本研究的重点是确定当与同样需要将视线从源文档上移开的输入方法（屏幕键盘）一起使用时，单词补全或单词预测程序是否会提高打字速度。10人参与了这项研究，5名男性和5名女性，年龄在20至38岁之间。该研究采用单受试者、连续干预设计，使用集成了单词预测软件的屏幕键盘来测试打字速度和准确性。7名参与者在使用单词预测功能时打字速度最快。两名参与者在使用单词补全功能时打字速度最快。只有一名参与者在使用这两个程序时打字速度没有提高。总体而言，这些结果表明，使用单词预测和单词补全功能可能有助于屏幕键盘用户提高打字速度。
