Abstract:Adding haptic feedback to touch screens is promising in improving users' productivity. However, most touch screens only track user's finger position when the user touches the screen. As a result, haptic feedback is not provided until touch is detected. This paper investigates adding haptic feedback in addition to visual feedback in hover space—the space above the touch screen. Four feedback conditions are compared in a multi-target pointing task. Experimental results show that there is no significant difference between the four feedback conditions as far as task completion speed and accuracy are concerned. The additional haptic feedback neither improves nor deteriorates performance as compared with the visual-only condition no matter it was added in hover space or as a button-click feedback. However, the button-click feedback is most favorable to users. Based on these results and previous literature, this study creats guidelines on how to add haptic feedback in hover space.