Autism is currently one of the most prominent and widely discussed human conditions. Its increased prevalence has intensified the demand for effective educational and therapeutic services, and intervention science is providing mounting evidence about practices that positively impact outcomes. The purpose of this report is to describe a set of…

Middle class children and adults (n=632) from eight age levels (mean ages 8, 9, 10, 11, 13, 17, 19 and 33 years) were tested with the Profile of Nonverbal Sensitivity (the PONS test) to measure accuracy in decoding nonverbal cues. The prediction that nonverbal skills would increasingly differentiate over ages was confirmed. (RH)

The relation between Matching Familiar Figures Test performance and Piaget's construct of perceptual activity was examined with 48 third- and fourth-grade boys. (SB)

The relationship between visual stimulus intensity and directional finger movements was examined in infants of two age groups (16 infants, 10 to 15 weeks old, and 8 infants, 20 to 25 weeks old). Two hypotheses derived from Schneirla's Approach-Withdrawal Theory were examined: (1) that responses of the younger, but not of the older infants, would…

Recognition by infants, 13 and 22 weeks old, was tested by pairing novel stimuli with the familiarization stimulus at different points in an experimental session. Younger subjects showed no recognition of either two- or three- dimensional stimuli. Older subjects demonstrated more recognition in the three-dimensional condition. (MS)

Reports results of a study of the development of perspective-taking skills of 180 English children aged six through ten. Children first are able to represent the object nearest the observer, then before-behind relationships, and subsequently left-right relationships between objects. Questions Piagetian conclusions that perspective-taking ability…

Results showed that 2- and 3-dimensional forms affected 4- and 8-week-old infant visual behavior differently. (Author/JMB)

The importance of awareness of the pictorial surface and point of observation was investigated in children and adults. The effect of station point was found to interact with pictorial surface and age, thus suggesting the development of a mechanism of compensation for the perspective distortion of oblique view. (JMB)

Children ranging in age from three to six years counted 7, 10, and 14 items arranged in columns or in rows. Developmental changes in the spatial strategy and the relation of strategy to accuracy were examined. (JMB)

Serial habituation of visual fixations was investigated through a design permitting cross-sectional, within-subject longitudinal, cohort longitudinal, and time-lag analyses. Results suggested that for all ages habituation was under way to the parts of the stimulus in order of the realitive saliencies. No one methodology appeared to significantly…

To assess the development of monocular slant perception as well as the relative effectiveness of different sources of information, 90 children in first, third, and fifth grades and 30 college adults were asked to make judgments of surface slant on the basis of monocular texture gradient information. (Author/JH)

Twenty-four subjects at each of four grade levels (first, third, fifth, and college) made judgments of physical slant of surfaces with three levels of variability. Absolute error of judgment decreased with age, but texture variability had no effect at any grade level. (JH)

The size of the effective visual field during the first weeks of life is found to depend on two factors: It increases with age, but contracts in the face of competition from ongoing activity such as fixation of a central stimulus or nonnutritive sucking. (Author/SB)