Conversational ease-based reasoning (CCBR) a form of interactive case-based reasoning where users input a partial problem description (in text). The CCBR system responds with ranked solution display, which lists the solutions of stored cases whose problem descriptions best match the user’s, and a ranked question display, which lists the unanswered questions in these cases. Users interact with t...

We demonstrate a new visualization technique to help researchers answer specific questions about 2D vector fields. Rather than directly display the vector field, the visualization isolates the integrable part of the field, integrates it to find a scalar potential, and displays the scalar potential as a height field. Scalar potential representation can be combined with direct field representatio...

Dynamic viewpoint tethering is an innovative display technique which has been proposed to support effective navigation in large-scale virtual environments, by integrating information from different frames of reference. The present study examines the effect of dynamic viewpoint tethering on performance, with respect to both local guidance and global awareness measures, in comparison with three c...

This article examines an important finding from the literature on infant numerical competence. The finding, reported by P. Starkey, E. S. Spelke, and R. Gelman (1990), was that infants looked longer toward a visual display that was equal in number to an auditory set. In Experiment 1, when the procedures described by P. Starkey et al. were followed and duration was held constant across auditory ...

Previous studies have shown that the efficiency of visual search does not improve when participants search through the same unchanging display for hundreds of trials (repeated search), even though the participants have a clear memory of the search display. In this article, we ask two important questions. First, why do participants not use memory to help search the repeated display? Second, can ...

Large display devices are now affordable and desirable in fixed environments such as offices, and scalable methods are available to combine multiple projectors to form such displays with high resolutions. With new input devices, they can facilitate new interaction paradigms. This paper describes the hardware and software of a wall-sized projected display controlled at a distance by a pointing d...

Two experiments were conducted in which participants performed a vehicle dispatching task. The intensity of one information source (vehicles in Experiment 1, destinations in Experiment 2) was varied to examine the effects of salience and discrimination on both searching for and processing the information in a cluttered display. Response times were recorded for questions either requiring focused...

Our goal in this article is to assess reliability and validity of egocentered network data collected through web surveys using multilevel confirmatory factor analysis under the multitrait multimethod approach. In this study, we analyze a questionnaire of social support of Ph.D. students in three European countries. The traits used are the frequency of social contact questions. The methods used ...