Multimodal feedback for the acquisition of small targets

Abstract

This paper examines how multimodal feedback assists small-target acquisition in graphical user interfaces. All combinations of three feedback modes are analysed: non-speech audio; tactile; and pseudo-haptic ‘sticky’ feedback. The tactile conditions used stimulation through vibration (rather than force-feedback), and the sticky conditions were implemented by dynamically reconfiguring mouse control-display gain as the cursor entered the target. Results show that for small, discretely located targets all feedback modes reduce targeting times, with stickiness providing substantial improvements. Furthermore, stickiness and tactile appear to combine well. However, the results of a more ecologically oriented menu-selection task show the need for caution, revealing that excessive feedback can damage interaction though ‘noise’ that interferes with the acquisition of neighbouring targets.

Keywords:

• Target acquisition
• Fitts' Law
• Multimodal feedback
• Tactile
• Non-speech audio
• Sticky targets

Acknowledgements

This work was conducted while S. Brewster was on sabbatical at the University of Canterbury in Christchurch. His work was funded by an Erskine Visiting Fellowship and EPSRC grant GR/S53244/01.