What shade of gray a surface appears is related to the perceived distribution of light and shadow, which in turn depends on the perceived spatial relation between the surface and its neighbors. (Author/ BB)

Describes subjective-contour illusions and gives explanations for perception of shape and brightness in these figures. Supports cognitive mechanisms rather than psychological mechanisms. Gives examples of subjective-contour illusions and summarizes explanations of other psychologists with regard to this topic. (CW)

THE IMPLICATIONS OF RESEARCH IN THE VISION SCIENCES FOR READING INSTRUCTION ARE DISCUSSED ON THE BASIS OF (1) STUDIES ON THE PERCEPTUAL BEHAVIOR OF CHILDREN AND THE EFFECT OF LANGUAGE DIRECTIONALITY ON PERCEPTION, (2) STUDIES ON VISUAL CHARACTERISTICS, (3) STUDIES ON THE RELATIONSHIP BETWEEN MOTOR COORDINATION AND READING ABILITY, (4) LONGITUDINAL…

Summarizes the anatomical, physiological, and psychological evidence related to the primate visual system. States that comparison of perceptual abilities with the electrophysiological properties of neurons may help deduce functions of visual areas. (RT)

From a series of lectures, a selection of eight are oriented principally toward the biologically developing child, and the physiological operations in visual process. The numbered lectures are--(1) The Coordinated Classroom, its Philosophy and Principles, (2) An Outline of a Biological Point of View, (3) The Evolution of Structure--despite man's…

Based on the more general principle that all thinking (including reasoning) is basically perceptual in nature, the author proposes that visual perception is not a passive recording of stimulus material but an active concern of the mind. He delineates the task of visually distinguishing changes in size, shape, and position and points out the…