ABSTRACT

Previous studies have used the Fitts’ Law to predict the performance of pointing task on touch screens. It was found that moving distance, target width, and the direction of motion would affect the task performance. The present research aimed to investigate the impact of the initial and terminal positions (ITPs) on pointing performance in two Exps. ITPs were divided into two categories: center of a screen and outer of a screen (center ↔ outer) pointing, and outer of a screen to outer of a screen (outer→outer) pointing. In Exp 1, 30 participants performed the center ↔ outer pointing tasks with 8 directions. The results showed that the outer → center movement was significantly faster than the center → outer at 45°, 90°, and 180°. In Exp 2, 30 participants performed the outer → outer pointing tasks with eight directions. The current study revealed that the ITPs influenced the performance of the pointing task, possibly due to human biomechanical characteristics associated with different movements.

摘要

以前的研究使用菲茨定律来预测触摸屏上指点任务的性能。发现移动距离、目标宽度和运动方向会影响任务性能。本研究旨在调查初始位置和终端位置 (ITP) 对两个 Exp 中指向性能的影响。ITPs分为两类：屏心外屏（center↔outer）指向，屏外到屏外（outer→outer）指向。在实验 1 中，30 名参与者执行了 8 个方向的中心↔ 外指向任务。结果表明，外→中心运动在45°、90°和180°时明显快于中心→外。在实验 2 中，30 名参与者执行了八个方向的外部→外部指向任务。