Data from a cough challenge study are displayed with dot charts to demonstrate the importance of graphs in understanding data, principles of graph construction and visual perception. The data are available for use in the classroom.

Schoolboys from the Ivory Coast and from Kenya were tested on a simple task intended to detect the effect of implicit-shape constancy. (Editor)

CHROMACODE is a conceptual tool that uses systematic, logical, and visual processes for organizing and analyzing qualitative research findings for the researcher with relatively low technical knowledge of data analysis. It can best be described as a visual conceptual scheme with coding based on a color-dependent procedure. Color provides a sense…

The possibility that subjective contours are an artifact of brightness contrast was explored. Concludes that subjective contour and brightness contrast are distinct perceptual phenomena but share a dependency on the processing of edge information transmitted through the achromatic channels of the visual system. (Editor/RK)

People presume that the light source in pictures comes from above, and there is some evidence that this phenomenon also demonstrates lateral biases. When investigators present multiple ambiguous stimuli or visually complex objects, people assume that the source of light is from above, and to the left. However, when single relatively simple stimuli…

A series of experiments tested a recent suggestion that vertical symmetry of a stimulus display can serve as a visual diagnostic for responding "same" in a letter-matching task. The data of chief interest were same reaction times to vertically symmetric (e.g., AA) and asymmetric (e.g., LL) displays, each composed of two side-by-side uppercase…

Attempts to establish the degree of perspective convergence, which the Western observer will accept as a realistic portrayal of objects drawn in perspective, and to determine the relationship between acceptable convergence and viewing conditions. (Author/RK)

The focus of this study was on the visual analysis of time series data for evaluating educational programs. Two characteristics of the data--changes in slope and variability--and two characteristics of evaluation--training in data utilization and the use of aimlines/decision rules--were manipulated. A total of 51 students and/or teachers in…

Graduate students individually examined 34 photographs for an investigation of commonly perceived underlying visual dimensions. Similarity judgements between photographs were used for multidimensional scaling; subject interview data were used to describe meaningful visual concepts. Results indicate that pictures were grouped in clusters along…

The ventral eye of "Limulus" (horseshoe crab) contains only one type of photoreceptor. Behaviors mediated by the ventral eye provide an unambiguous representation of the function of that single-receptor type. Compares such behaviors with results of acute, single-cell investigations to assay for the contributions of candidate neural codes in the…

Noting that the equipment traditionally used in eye movement research is both expensive and stationary in nature, this report describes apparatus for collecting and interpreting eye movement data that is both relatively inexpensive and portable. The report lists and describes hardware and software components of a data collection and data analysis…

Vigilance performance of twenty fourth-grade retarded readers was compared with that of twenty normal readers matched for age, sex, grade, and intelligence. (Authors)

Research on the analysis of time-series data has shown that decisions reached through visual analysis of the data may be influenced by the statistical parameters of those data. The current study investigated the statistical properties of curriculum-based time-series data for 68 elementary resource room students in four Minnesota school districts.…

This paper discusses a longitudinal, exploratory study of developmental dimensions related to object permanence theory and explains how multidimensional scaling techniques can be used to identify developmental dimensions. Eighty infants, randomly assigned to one of four experimental groups and one of four counterbalanced orders of stimuli, were…

The focus of this study was on the relationship between visual and statistical analyses of time series data and the degree to which characteristics of the data influenced this relationship. A total of 52 teachers took part in evaluating a series of graphs having prespecified characteristics. The independent variables manipulated included: slope,…