Shota Yamanaka

schoolLY Corporationbar_chart#815 Global Rank

Total Papers

HCI Rank

#815

Research Areas

Years Active

Recent Publications

Skewed Dual Normal Distribution Model: Predicting 1D Touch Pointing Success Rate for Targets Near Screen Edges

Typical success-rate prediction models for tapping exclude targets near screen edges; however, design constraints often force such placements. Additionally, in scrollable UIs any element can move close to an edge. In this work, we model how target--edge distance affects 1D touch pointing accuracy. We propose the Skewe…

CHI '263rd AuthorImmersion & Presence Research +2

Improving the Steering Law Throughput Calculation by Defining Effective Parameters for 3D Virtual Environments

Throughput is a widely used performance metric, combining speed and accuracy into a single measure, while reducing the effect of subjective speed–accuracy trade-offs. Despite its wide application in 2D steering tasks, its direct extension to 3D presents unique challenges since 3D trajectories exhibit higher variabilit…

CHI '26CorrespondingCrowdsourcing Task Design & Quality Control +2

Improving Data Quality via Pre-Task Participant Screening in Crowdsourced GUI Experiments

In crowdsourced user experiments that collect performance data from graphical user interface (GUI) interactions, some participants ignore instructions or act carelessly, threatening the validity of performance models. We investigate a pre-task screening method that requires simple GUI operations analogous to the main…

CHI '261st AuthorTouchscreen Usability & Performance Modeling (Fitts' Law)

Normalizing Speed-accuracy Biases in 2D Pointing Tasks with Better Calculation of Effective Target Widths

For evaluations of 2D target selection using Fitts' law, ISO 9241-411 recommends using the effective target width (W_e) calculated using the univariate standard deviation of selection coordinates. Related research proposed using a bivariate standard deviation; however, the proposal was only tested using a single speed…

MOBILEHCI '241st AuthorPrototyping & User Testing +1

Verifying Finger-Fitts Models for Normalizing Subjective Speed-Accuracy Biases

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 th…

CHI '241st AuthorUser Research Methods (Interviews, Surveys, Observation) +1

The Effect of Latency on Movement Time in Path-steering

In current graphical user interfaces, there exists a (typically unavoidable) end-to-end latency from each pointing-device movement to its corresponding cursor response on the screen, which is known to affect user performance in target selection, e.g., in terms of movement time (MT). Previous work also reported that a…

CHI '231st AuthorVoice User Interface (VUI) Design +1

Varying Subjective Speed-accuracy Biases to Evaluate the Generalizability of Experimental Findings on Pointing-facilitation Techniques

In typical experiments to evaluate novel pointing-facilitation techniques, participants are asked to perform a task as rapidly and accurately as possible. However, the balance can differ among participants, and the techniques' effectiveness would change if the majority of participants give weight to either speed or ac…

CHI '191st AuthorPrototyping & User Testing +1

Modeling Fully and Partially Constrained Lasso Movements in a Grid of Icons

Lassoing objects is a basic function in illustration software and presentation tools. Yet, for many common object arrangements lassoing is sometimes time-consuming to perform and requires precise pen operation. In this work, we studied lassoing movements in a grid of objects similar to icons. We propose a quantitative…

CHI '19CorrespondingHonorable MentionPrototyping & User Testing +1

Steering Performance with Error-accepting Delays

In steering law tasks, deviating from the path is immediately considered an error operation. However, in navigating a hierarchical menu item, which is a representative application of the law, a deviation within a short duration is sometimes permitted. We tested the validity of the steering law model with various durat…

CHI '181st AuthorPrototyping & User Testing

Steering through Successive Objects

We investigate stroking motions through successive objects with styli. There are several promising models for stroking motions, such as crossing tasks, which require endpoint accuracy of a stroke, or steering tasks, which require continuous accuracy throughout the trajectory. However, a task requiring users to repeate…

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