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HCI Research

Movements in our upper limbs and visual information together play an important role in the human computer interface.  As illustrated in the above figure, the three types of fundamental movements in a graphical user interface can be identified as  targeting, tracking and targeted-tracking. Fitts' Law (1954) has been applied to model movement time in targeting tasks and Drury's Law (1971) has been applied to that of tracking tasks. 

Two models (Dennerlein et al., 2000; Kulikov &, Stuerzlinger, 2006) have been proposed to model movement time in targeted-tracking tasks. Dennerlein et al. (2006) assumed both targeting and tracking difficulties affect movement time throughout the movement process. In addition to the mentioned hypothesis, Kulikov and Stuerzlinger (2006) assumed that both index of difficulties contribute in the same potency. Since these models provide little contribution to understand the process, based on the hypothesis that movement in targeted-tracking is a two component task i.e., an initial and then final homing-in phase, a computer mouse based experiment was conducted to capture both open-loop and feedback controlled movements. An empirical model, as given in the following table, was developed to predict movement time based on the overall difficulty of each component.

In another experiment, the model was further validated for several input devices. There, we used a gaming computer mouse, pen mouse, graphics tablet and touchscreen. The importance of the model in designing, optimizing and evaluating computer input devices and graphical user interfaces was further discussed. 

Since tracking is essentially a component in targeted-tracking and, due to lack of availability in literature on tracking, human performance in tracking tasks was also separately  investigated to determine optimal settings for input devices.

Currently we are working on analyzing the velocity profiles to understand the dynamics of human arm movements with the intention of mimicking in robotic arms for efficient and smooth manipulation. 

Subpages (1): HCI Research Appendix