We investigate the use of external visual representations in probability problem solving. Twenty-six students enrolled in an introductory statistics course for social sciences graduate students (post-baccalaureate) solved eight probability problems in a structured interview format. Results show that students spontaneously use selfgenerated external visual representations while solving probabili...

If one defines a visual front-end to be that part of a visual system in which the structure of the optical world is represented in some least committed form, then it is plausible to assert that it reflects the structural properties, notably symmetries, of the optical environment. We propose a methodology for constructing receptive field assemblies consistent with these symmetries, which contrib...

December 22, 2006 1 Visual Representations of Executing Programs Steven P. Reiss Department of Computer Science Brown University Providence, RI 02912-1910 401-863-7641, FAX: 401-863-7657 {spr}@cs.brown.edu Abstract Programmers have always been curious about what their programs are doing while it is executing, especially when the behavior is not what they are expecting. Since program execution i...

hy du we often prefer glancing at a graph to studying a table of numbers? What might be a better graphic than either a graph or table for seeing how a biological process unfolds with time? To begin to answer these kinds of questions we examine the cognitive structure of graphics and report a structural classification of visual representadnns. McCormick, DeFami, and Brown [16] define visualizati...

Computer vision researchers are developing new approaches to object recognition and detection that are based almost directly on images and avoid the use of intermediate three-dimensional models. Many of these techniques depend on a representation of images that induce a linear vector space structure and in principle requires dense feature correspondence. This image representation allows the use...

We conducted two studies that investigated display characteristics related to color (hue, saturation, brightness, and transparency) and contrast with a background for displaying information qualifiers (termed meta-information) such as uncertainty, age, and source quality. Level of detail (or granularity) of the meta-information and task demands were also manipulated. Participants were asked to ...

The problem of reconstructing signed permutations on n elements from their erroneous patterns distorted by reversal errors is considered in this paper.A reversal is the operation of taking a segment of the signed permutation, reversing it, and flipping the signs of its elements. The reversal metric is defined as the least number of reversals transforming one signed permutation into another. It ...

The contents of this paper describe the work carried out by the Visualisation Research Group in the Centre of Software Maintenance at the University of Durham. For obtaining a high level understanding of the code systems graphical representations are more useful than purely textual representations. However, graphical representations still have a tendency to provide the maintainer with too much ...

BACKGROUND How do people sustain a visual representation of the environment? Currently, many researchers argue that a single visual working memory system sustains non-spatial object information such as colors and shapes. However, previous studies tested visual working memory for two-dimensional objects only. In consequence, the nature of visual working memory for three-dimensional (3D) object r...