Publications
CONFERENCE (INTERNATIONAL) Verifying Finger-Fitts Models for Normalizing Subjective Speed-Accuracy Biases
Shota Yamanaka, Hiroki Usuba, Yosuke Oba (Meiji University), Taiki Kinoshita (Meiji University), Ryuto Tomihari (Meiji University), Nobuhito Kasahara (Meiji University), Homei Miyashita (Meiji University)
The ACM International Conference on Mobile Human-Computer Interaction (MobileHCI 2024)
October 01, 2024
Previous studies on the Finger-Fitts law (FFitts law) are lacking in sufficient experiments to verify its inherent potential. Since the FFitts law is originally a modified version of the effective width method to normalize speed-accuracy biases, the model fit would improve if multiple biases were mixed together and the throughputs would be more stable than using the nominal target width. In this study, we conduct an experiment in which participants tap 1D-bar and 2D-circular targets under three subjective biases: balancing the speed and accuracy, emphasizing speed, and emphasizing accuracy when they perform the tasks. The results showed that applying the effective width to Ko et al.'s refined FFitts law, which represents the touch ambiguity with a free parameter, was the most successful in normalizing biases. Reanalyzing another dataset on ray-casting pointing also led to the same conclusion. We thus recommend using Ko et al.'s model with effective width when researchers compare several experimental conditions such as devices and user groups.
Paper :
Verifying Finger-Fitts Models for Normalizing Subjective Speed-Accuracy Biases
(external link)