Eric D. Ragan

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Spatial judgments are important for many real-world tasks in engineering and scientific visualization. While existing research provides evidence that higher levels of display and interaction fidelity in virtual reality systems offer advantages for spatial understanding, few investigations have focused on small-scale spatial judgments or employed(More)
We propose the use of virtual environments to simulate augmented reality (AR) systems for the purposes of experimentation and usability evaluation. This method allows complete control in the AR environment, providing many advantages over testing with true AR systems. We also discuss some of the limitations to the simulation approach. We have demonstrated(More)
While the primary goal of visual analytics research is to improve the quality of insights and findings, a substantial amount of research in provenance has focused on the history of changes and advances throughout the analysis process. The term, provenance, has been used in a variety of ways to describe different types of records and histories related to(More)
1875-9521/$ see front matter 2011 International doi:10.1016/j.entcom.2011.03.002 ⇑ Corresponding author. Tel.: +1 540 230 6634. E-mail address: (R.P. McMahan While commercial, off-the-shelf video games have been used often to observe cognitive and social phenomena, few studies have taken advantage of such games as research tools for(More)
Problem-based learning is a pedagogy that employs open-ended problems as a means of increasing student motivation and interaction in addition to achieving the intended educational goals. We present product-based learning as an extension of collaborative problem-based learning by focusing on the design and development of a product as a solution to a proposed(More)
Team politics complicate software projects. They cause internal conflicts that can not only cost a software team time and money, but may also detract from the needs of the product’s end users. In this paper, we explore the use of concept maps as a means of mitigating such team conflicts. Approaching agile usability through the lens of distributed cognition,(More)
This study explores how spatial layout and view control impact learning. We performed a controlled experiment using a learning activity involving memory and comprehension of a visually represented story. We present our preliminary results comparing performance between a slideshow-type presentation on a single monitor and a spatially distributed presentation(More)
While it has been suggested that immersive virtual environments could provide benefits for educational applications, few studies have formally evaluated how the enhanced perceptual displays of such systems might improve learning. Using simplified memorization and problem-solving tasks as representative approximations of more advanced types of learning, we(More)
Disaster relief responders aim to quickly locate and extract survivors from dangerous environments. This research explores the use of a collaborative guidance system for search-and-rescue in a complex building. We implemented and evaluated a proof-ofconcept system that allowed a scene commander and responder to efficiently search a building using visual,(More)
Researchers have proposed that immersion could have advantages for tasks involving abstract mental activities, such as conceptual learning; however, there are few empirical results that support this idea. We hypothesized that higher levels of immersion would benefit such tasks if the mental activity can be mapped to objects or locations in a 3D environment.(More)