Steve Haroz

Research Scientist

The goal of my research is to bridge the gap between computer science and psychology. This work falls into the computer science areas of HCI (human-computer interaction) and Visualization as well as the psychology and neuroscience areas of perception and attention.


ISOTYPE Visualization

isotype visualization News media often use stacks of little icons to represent a value in a chart. These "ISOTYPE visualizations" are supposedly more appealing and engaging. But are they perceived more accurately or rememebred better? If so, why?

Connected Scatterplot

Connected Scatterplots How can you engagingly present a pair of time series? Journalists have recently revitalized an old graph type, called a "Connected Scatterplot", as they assume it is effective and engaging. We ran a collection of experiments to test these assumptions.

Limits of Visualization

limits of visualization How do capacity limits of attention impact visualization effectiveness? What roles do user-goals and design descisions play in those limits? How do visual features such as color and motion differ? This study seeks to answer these fundamental questions about visualization.

Ensemble Biological Motion

Seeing the Crowd: ensemble biological motion (colors)When we perceive a crowd of people, must our visual system serially examine each person, or can we rapidly percieve the summary or gist? What, if any, side effects might result from a encoding a crowd as an individual percept?

Natural Visualizations

spatial frequency explanation The visual system is built to most efficiently represent natural stimuli, which are noted to have power spectra that follow a f-2 trend. Since visualizations attempt to provide insight by sending data through the visual system, we tested visualization screenshots to test their power spectra. By running the results of the IEEE InfoVis contest through some image analysis, we found that the winners of the competition tend to have similar properties to the visual system.

Cosmological Visualization

cosmological visualizationFor this project, we aimed to create an application that could visualize millions of simulated cosmological particles and show how each varied across time and simulation run. The resulting application uses custom controls, infovis views, scivis views, and graphics hardware to give users multiple, real-time, interactive perspectives of the differences between particles.

Perception of Optic Flow

perception of optic flowWhat are the limits of our perception of optic flow? How does it impact our ability to detect a features in fields of motion? We investigated these questions and explored the use of this visual feature in visualization.

The poster was presented at APGV 2010.

Layout of Multiple Views for Volume Visualization: A User Study

visualization layout user studyIn this user study, we analyzed layout schemes of multiple views. The goal was to determine whether different arrangements were beneficial in understanding time-varying volume visualizations. We conducted a user study of four layout techniques for multiple views. Participants were timed as they separated different aspects of volume data for both time-invariant and time-variant data using one of four different layout schemes. For time-variant data, the multiple view layouts all resulted in better times than did the single view. Surprisingly, different layout techniques for multiple views resulted in no noticeable difference in user performance.