In this study instead of the experimenter controlling the duration of stimulus exposure, the infants' behavior was allowed to control stimulus duration. (Authors/MB)

Series of experiments indicates that young infants are more sensitive to the spatial orientation of forms than was previously thought. This report is based on a dissertation submitted to the University of Strathclyde, August, 1969, in partial fulfillment of the requirements for the degree of MSc. (MH)

Infants living in various geographic locations are found to differ as much as 9 pounds in average body weight, 5.5 inches in average body length, and 2.5 inches in average chest circumference. (Author/WY)

Infants were able to discriminate between bah" and gah" syllables, indicating that linguistic-perceptual capacities are present during early life. (WY)

Reports on an experiment which involved 42 7 1/2-10 1/2-month-old infants playing a two-position hidden-object game. Results were interpreted to support and extend previous explanations of Stage IV of object-concept development. This report is a revised version of a paper presented at the biennial meeting of the Society for Research in Child…

The tracking behavior of Infants up to 5 months of age was studied using linear and circular trajectories, with partial occlusion of the trajectories. Results indicate that it is not until the age of about 16 weeks that infants can be said to be tracking a moving object as an object. (Author/WY)

Consistent age changes suggest 2 overlapping developmental dimensions: (1) The ability to deal with visible versus invisible displacements, and (2) with nonsequential versus sequential displacements. Other findings are included. (MH)