Gestalt phenomena are often so powerful that mere demonstrations can confirm their existence, but Gestalts have proven hard to define and measure. Here we outline a theory of basic Gestalts (TBG) that defines Gestalts as emergent features (EFs). The logic relies on discovering wholes that are more discriminable than are the parts from which they…

Multisensory integration of spatial information occurs late in childhood, at around eight years (Gori, Del Viva, Sandini, & Burr, 2008). For younger children, the haptic system dominates size discrimination and vision dominates orientation discrimination: the dominance may reflect "sensory calibration," and could have direct consequences on…

This research was conducted in order to examine the influence of manifest strabismus and stereoscopic vision on non-verbal abilities of visually impaired children aged between 7 and 15. The sample included 55 visually impaired children from the 1st to the 6th grade of elementary schools for visually impaired children in Belgrade. RANDOT stereotest…

The paper presents a unique approach in associating perspective projection with the image beheld by the eye and demonstrates that all graphical and photographic perspective projections must contain distortion when compared to the image beheld by the eye. (Contains 8 figures.)

The purpose of this study was to examine predictors of music sight-reading ability. The authors hypothesized that speed and accuracy of music sight-reading would be predicted by a combination of aural pattern discrimination, spatial-temporal reasoning, and technical proficiency. Participants (N = 70) were wind players in concert bands at a…

Visual scanning behavior and efficiency of 22 children with visual disabilities and 25 children without disabilities (ages 3.5 to 10 years) were studied. Significant differences were found between groups in length of scan path and number of objects reported, but no significant differences in scanning efficiency. Coordinated binocular eye movements…

Describes an experiment revealing a visual latency effect produced by the wearing of sunglasses. (SL)

USING A SAMPLE OF 94 CHILDREN (31 TO 54 MONTHS OLD), THIS STUDY COMPARED EIGHT VISION SCREENING PROCEDURES FOR YOUNG CHILDREN IN THE ABILITY TO TEST FOR SEVERAL VISUAL FUNCTIONS, AND PREFERENCE AMONG THEM BY CHILDREN. THE SUBJECTS WERE ORIGINALLY TESTED USING THE EIGHT SCREENING TESTS, AND 6 MONTHS LATER 40 OF THE CHILDREN WERE RETESTED FOR…

THE SUBJECT OF THIS EXPERIMENTAL PROGRAM WAS THE RECOGNITION OF, OR CONCEPTUAL RESPONSE TO, COMPLEX VISUAL STIMULI BY COLLEGE STUDENTS. PROGRAMED INSTRUCTIONAL TECHNIQUES WERE USED IN THE SUBJECT CONTEXT TO DEVELOP PRELIMINARY SELF-TEACHING MATERIALS FOR LEARNING COMPLEX CONCEPTS. THESE PROGRAMING TECHNIQUES WERE IMPLEMENTED TO PRODUCE VISUAL…

Various eye problems and the effects they can have on children's reading abilities are explored in this pamphlet, which is one of a series designed to answer parents' questions about their children's reading development. Topics discussed are the demands on vision made by reading, problems that affect visual acuity (nearsightedness, farsightedness,…

Tests newborns' ability to detect a dot with central vision and compares both the proportion of time the infants fixated centrally and the duration of each central fixation. Subjects were 46 newborns ranging in age from 1 to 7 days. (MP)

A discription of teaching activities and seeing distances makes it easier to prescribe correct lenses. (AP)

The Ebbinghaus (Titchener) illusion was examined in a remote culture (Himba) with no words for geometric shapes. The illusion was experienced less strongly by Himba compared with English participants, leading to more accurate size contrast judgments in the Himba. The study included two conditions of inducing stimuli. The illusion was weaker when…

Rod-isolation techniques show that light-adapted human rods detect flicker frequencies as high as 28 hertz, and that the function relating rod critical flicker frequency to stimulus intensity contains two distinct branches. (MLH)