Tam Cynthia, Wells David
Bloorview Kids Rehab, University of Toronto, Toronto, Ontario, Canada.
Assist Technol. 2009 Fall;21(3):105-14. doi: 10.1080/10400430903175473.
Visual-cognitive loads influence the effectiveness of word prediction technology. Adjusting parameters of word prediction programs can lessen visual-cognitive loads. This study evaluated the benefits of WordQ word prediction software for users' performance when the prediction window was moved to a personal digital assistant (PDA) device placed at the keyboard level. Twenty-one young people aged 11-14 (11 new users and 10 experienced users) participated in the study. The Canadian Occupational Performance Measure was used to measure users' self-ratings of performance and satisfaction. Results of two-tailed paired t-tests reveal significantly (p < .05) higher performance and satisfaction ratings when the word prediction list was displayed on the PDA. Users reported that it was easier to look for the words at the keyboard level and to select words directly from the PDA. Visual comparisons of the users' typing speed and accuracy show that experienced users had faster typing rates and new users appeared to have better accuracy when they typed with WordQon the PDA display. Further studies with larger samples of individuals with different diagnoses and ages are required to confirm the benefit of using a PDA display in enhancing typing rate and accuracy.
视觉认知负荷会影响单词预测技术的有效性。调整单词预测程序的参数可以减轻视觉认知负荷。本研究评估了将预测窗口移至放置在键盘高度的个人数字助理（PDA）设备上时，WordQ单词预测软件对用户表现的益处。21名年龄在11至14岁之间的年轻人（11名新用户和10名有经验的用户）参与了该研究。使用加拿大职业表现测量工具来衡量用户对表现和满意度的自我评分。双尾配对t检验结果显示，当单词预测列表显示在PDA上时，表现和满意度评分显著更高（p < .05）。用户报告称，在键盘高度查找单词并直接从PDA中选择单词更容易。对用户打字速度和准确性的直观比较表明，有经验的用户打字速度更快，而新用户在PDA显示屏上使用WordQ打字时似乎准确性更高。需要对更多不同诊断和年龄的个体进行进一步研究，以证实使用PDA显示屏在提高打字速度和准确性方面的益处。
