Time Prediction Model for Pointing at Target Having Different Motor and Visual Width with Distractors

Anonymous

Keywords: Difference between motor and visual widths, distractor, pointing, Fitts' law, GUIs

TL;DR: Extending Fitts' law to enable it to predict the movement time of pointing operations in interfaces, such as in navigation bars whose items have different motor and visual widths and intervals between a target and distractors.

Abstract:

In this study, we extend Fitts' law to enable it to predict the movement time of pointing operations in interfaces, such as in navigation bars whose items have different motor and visual widths and intervals between a target and distractors.
For this, we conduct two experiments to investigate the presence or absence of the distractors that affect pointing operations and how increasing the size of the intervals changes user performance.
We found that the movement time is strongly affected by the motor width and intervals and slightly by the visual width.
On the basis of the results, we constructed a model for considering the difference between the motor and visual widths and the intervals between the target and distractors.
The model allows user-interface designers to configure these factors on the basis of movement time.
Our model also showed a good fit for not only the data of our two experiments but also those of three previous studies.
We also discuss future work for making our model more practical.