Robert A. Virzi

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It has recently been proposed that in searching for a target defined as a conjunction of two or more separable features, attention must be paid serially to each stimulus in a display. Support for this comes from studies in which subjects searched for a target that shared a single feature with each of two different kinds of distractor items (e.g., a red O in(More)
In two experiments, each using a different product (either a CD-ROM based eleclxonic book or an interactive voice response system), we compared the usability problems uncovered using lowand high-fidelity prototypes. One group of subjects performed a series of tasks using a paperbased low-fidelity prototype, while another performed the same tasks using(More)
According to feature-integration theory, when attention is diverted from a display, features from different objects in that display may be wrongly recombined, giving rise to "illusory conjunctions" (Treisman & Schmidt, 1982). Two experiments are reported that examine the nature of these illusory conjunctions. In displays that contain color names and(More)
Menus, lists, and forms are the workhorse dialogue structures in telephone-based interactive voice response applications. Despite diversity in applications, there is a surprising homogeneity in the menu, list, and form styles commonly employed. There are, however, many alternatives, and no single style fits every prospective application and user population.(More)
It is compared an electrophoretic study between unconcentrated and concentrated urine samples on cellulose acetate and immunoelectrophoresis. The study shows that the findings carried out on cellulose acetate are overlapped with the immunochemical methods therefore the cellulose acetate may be preferred an useful medium on the electrophoretic assay of the(More)
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