Elderly subjects demonstrated significantly greater levels of persistence. Contrast relationship of the target stimulus and its background did not interact with age. Although the data were consistent with a hypothesis of increased persistence of stimuli in the senescent nervous system, problems in the direct measurement technique are evident.…

The influence of frequency of occurrence of a visual stimulus on encoding processes is investigated, to discover what mechanisms allow cognitive processes to modify perceptual processes. Six experiments are described and the results are discussed. (MH)

Demonstrates that a representation of a figure through object reconstruction is prerequisite to recognizing the object figure from a collection of figures, which in turn is prerequisite to representing the object figure using a pencil-and-paper reproduction. (RL)

After learning to discriminate tactually between a convexity and a concavity, 101 children aged three to eight years were presented a photograph of the convexity and the concavity. The relevance of egocentric, environmental, and lighting-specified frames of reference was manipulated by changing the position of the subject's head, rotating the…

A discussion of Edwin Land's experiments with color images from black-and-white photographs. Information is presented for duplication of these experiments by the amateur photographer. (BB)

Defines holography, identifies visual factors in driving and the techniques used in on-road visual presentations, and presents the design and testing of a holographic system for driver training. (RAO)

Visual pattern preferences were established for 96 9- and 13-week-old infants using stimuli varying in contour density presented either at a low, moderate, or high luminance level. Age differences in the maximally preferred patterns across stimuli and luminance levels indicated that luminance interacts with contour density in determining stimulus…

The ability of forty 8-week-old infants to discriminate between projected-stereograms with and without retinal disparity was tested with an habituation-dishabituation paradigm. Results were interpreted as indicating that the infants could discriminate between stimuli when the only difference between them was binocular disparity. (MS)

Evaluated with a total of 60 primary-grade children was the effectiveness in improving ocular motor control of three training programs: the Bender proprioceptive facilitative feedback exercises, the Marsden ball program, and perceptual exercises. (DB)

This article is concerned with the perceptual load in searching for a number of kinds of target which are presented for a fixed, short period of time. The aim is to establish data which any acceptable model of human information processing will need to fit. (Author)

Considers whether any sort of orthographic mechanism is used by fluent readers. (Author/RK)

Two initial experiments demonstrated that direction aftereffects of potentiation in the extraocular muscles (induced through sustained versional rotation to the side) generally increase as a function of the magnitude and duration of the inducing ocular rotation and can be built up under conditions of varied as well as constant fixation. (Editor)

A dual-task paradigm was used to assess attentional processing demands during visual word recognition. By manipulating the difficulty of each task, it is argued that the procedure estimates the attention demands of the memory-access component of word recognition. (Editor)

Discusses research which compared the performance of children with reading disabilities to the performance of normal readers, matched for age and reading level, in a backward-masking letter-identification and localization task. (JM)