Computing Touch-Point Ambiguity on Mobile Touchscreens for Modeling Target Selection Times

Author:

Yamanaka Shota1,Usuba Hiroki2

Affiliation:

1. Yahoo Japan Corporation, Chiyoda-ku, Tokyo, Japan

2. Meiji University, Nakano-ku, Tokyo, Japan

Abstract

Finger-Fitts law (FFitts law) is a model to predict touch-pointing times, modified from Fitts' law. It considers the absolute touch-point precision, or a finger tremor factor σa, to decrease the admissible target area and thus increase the task difficulty. Among choices such as running an independent task or performing parameter optimization, there is no consensus on the best methodology to measure σa. This inconsistency could be detrimental to HCI studies such as pointing technique evaluations and user group comparisons. By integrating the results of our 1D and 2D touch-pointing experiments and reanalyses of previous studies' data, we examined the advantages and disadvantages of each approach to compute σa. We found that the parameter optimization method is a suboptimal choice for predicting the performance.

Publisher

Association for Computing Machinery (ACM)

Subject

Computer Networks and Communications,Hardware and Architecture,Human-Computer Interaction

Cited by 4 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Model Touch Pointing and Detect Parkinson's Disease via a Mobile Game;Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies;2024-05-13

2. Behavioral Differences between Tap and Swipe: Observations on Time, Error, Touch-point Distribution, and Trajectory for Tap-and-swipe Enabled Targets;Proceedings of the CHI Conference on Human Factors in Computing Systems;2024-05-11

3. Tuning Endpoint-variability Parameters by Observed Error Rates to Obtain Better Prediction Accuracy of Pointing Misses;Proceedings of the 2023 CHI Conference on Human Factors in Computing Systems;2023-04-19

4. Test-retest Reliability on Movement Times and Error Rates in Target Pointing;Designing Interactive Systems Conference;2022-06-13

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