Tim Halverson

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In the course of running an eye-tracking experiment, one computer system or subsystem typically presents the stimuli to the participant and records manual responses, and another collects the eye movement data, with little interaction between the two during the course of the experiment. This article demonstrates how the two systems can interact with each(More)
Visual search is an important part of human-computer interaction. It is critical that we build theory about how people visually search displays in order to better support the users' visual capabilities and limitations in everyday tasks. One way of building such theory is through computational cognitive modeling. The ultimate promise for cognitive modeling(More)
In this project, eye tracking researchers and computer music composers collaborate to create musical compositions that are played with the eyes. A commercial eye tracker (LC Technologies Eyegaze) is connected to a music and multimedia authoring environment (Max/MSP/Jitter). The project addresses issues of both noise and control: How will the performance(More)
While much basic research exists on the effects of various visual properties on visual search, the application of such research to real-world tasks is lacking. The purpose of this research is to address the lack of empirical validation for design guidelines that affect visual search. One common design element used in Web interface design is link color. The(More)
Art, music, and science come together as computer musicians and computer scientists collaborate to create EyeMusic, a system for composing and performing eyecontrolled musical and multimedia compositions. In EyeMusic, an eye-tracking device communicates with a musical and multimedia authoring environment to enable composers and artists to sonify and(More)
Three peptides with growth-inhibitory activity towards the gram-negative bacterium Eschericia coli were isolated from electrically stimulated secretions from the skin of the southern leopard frog, Rana sphenocephala. Structural characterization demonstrated that the peptides [brevinin-1Sa, minimum inhibitory concentration (MIC) = 55 microM; brevinin-1Sb,(More)
Eight peptides with differential growth-inhibitory activity against the gram-positive bacterium Staphylococcus aureus, the gram-negative bacterium Escherichia coli and the yeast, Candida albicans were isolated from an extract of the skin of the North American pig frog Rana grylio. The primary structures of these antimicrobial peptides were different from(More)
Ten peptides with differential growth-inhibitory activity against the gram-positive bacterium, Staphylococcus aureus, the gram-negative bacterium, Escherichia coli, and the yeast Candida albicans were isolated from an extract of the skin of a North American frog, the green frog Rana clamitans. Ranatuerin-1C (SMLSVLKNLGKVGLGLVACKINKQC), ranalexin-1Ca(More)
This research investigates the cognitive strategies and eye movements that people use to search for a known item in a hierarchical computer display. Computational cognitive models were built to simulate the visual-perceptual and oculomotor processing required to search hierarchical and nonhierarchical displays. Eye movement data were collected and compared(More)