Infants' visual perception of number change was investigated in three studies. These studies focused on infants' perception of events in which the total number of objects in a small group was changed through addition of another object. Involving 60 infants 5 months of age, Study I attempted to determine whether subjects perceived the properties in…

Butler (1980) compared errors representing intrusions and mislocalizations on 3x3 letter displays under pattern-mask versus no-mask conditions and found that pattern masking increased character mislocalization errors (naming a character in the display but not in the target position as being the target) over intrusion errors (naming a character not…

The paper reviews issues in evaluating the manual communications skills of pre-college hearing impaired students, including testing of visual discrimination and visual memory, simultaneous communication, and attention span. (CL)

TEN PAIRS OF BLIND CHILDREN AGED SIX TO 13 YEARS WHO HAD SOME VISION WERE MATCHED BY PRETEST SCORES ON A TEST OF VISUAL DISCRIMINATION. A CRITERION GROUP, DESIGNATED THE PRINT COMPARISON GROUP, HAD SLIGHLY HIGHER RECORDED DISTANCE ACUITIES AND USED VISION AS THE PRIMARY MEANS OF LEARNING. PAIRS OF EXPERIMENTAL SUBJECTS DAILY RECEIVED 45 MINUTES OF…

A STUDY WAS CONDUCTED TO DETERMINE WHETHER PEOPLE CAN CHANGE THEIR PERCEPTUAL PROCESSING STRATEGIES TO INCLUDE TESTS FOR THE PRESENCE OF ONLY THOSE STIMULUS FEATURES NECESSARY FOR THE TASK AT HAND. LEARNING DURING PRACTICE AND THE EFFECT OF AGE ON THE ABILITY TO USE OPTIMAL STRATEGIES WERE INVESTIGATED. A DISJUNCTIVE REACTION TIME PROCEDURE WAS…

THE EFFECTIVENESS OF TWO TRAINING METHODS TO FOCUS ATTENTION ON THE CRITICAL FEATURES OF LETTER-LIKE FORMS WAS STUDIED. SUBJECTS WERE 32 KINDERGARTEN PUPILS. SIX NONSYMETRICAL, STANDARD LETTER-LIKE FORMS AND FOUR TRANSFORMATIONS, CONSISTING OF RIGHT-LEFT AND UP-DOWN REVERSALS, 180 DEGREES AND 90 DEGREES ROTATION, WERE USED AS STIMULI TO LEARNING.…

Although there has been previous research concerned with image size, brightness, and contrast in projection standards, the work has lacked careful conceptualization. In this study, size was measured in terms of the visual angle subtended by the material, brightness was stated in foot-lamberts, and contrast was defined as the ratio of the…

Proceedings of a seminar on the present status of vision engineering and the possible effects on criteria for school planning. A discussion by Dr. H. Richard Blackwell on vision engineering is included. Topics of discussion include--(1) broad aspects of the effect of light upon sight, (2) lighting variables and task visibility, (3) lighting…

The results of all basic measurements and calculations of reflected glare for different lighting materials and conditions are presented in a series of tables and charts. All basic concepts of a quantitative method for evaluating the visual significance of reflected glare are identified in relationship to different types of visual performance. The…

Is the perception of velocity determined by the prior discrimination of spatial and temporal distances? Two experiments sought to answer this question by comparing the discriminabilities of moving stimuli varied in spatial extent, temporal duration, or in redundant combinations of both variables. (Editor)

A study of eighty Canadian kindergarten children showed that discrimination of similar letters was more difficult than distinctive letter discrimination, irrespective of training format or mode of testing. (MJB)

Forty-seven infants at-risk for mental retardation were divided into a group that received early day-care intervention and a matched control group that did not. (Author)