Study supported through a U. S. Public Health Service Fellowship award to Ludwig Immergluck for his work at the Harvard Florence Research Project in Florence, Italy. (AP)

On the basis of a conservation of substance experiment with 189 blind and partially sighted children, it is inferred that while the best of them are performing on a par with the best of their sighted peers, the age range in which conservation is attained is more extended for the visually handicapped. (Author)

Although Ss underestimated the size of the illusion in the predicted direction, no significant correlations between size of illusion and either age or IQ were found. (Authors)

Study of perceptual exploration was undertaken to see to what extent school experience would produce left-right patterns on several kinds of figures which have strong Gestalt properties. (Author)

Two major trends in the development of natural language concepts were found in the present study: (1) there was a clear indication that such concepts exist in a relatively fragmented form in young children; (2) young children showed a strong dependence on perceptual attributes in their definitions of concepts. (Author/CB)

For the age range tested there is a lag between the perception and production of certain facial expressions. (Authors)

This paper presents two studies of the development of social competencies in infancy. In the first experiment, the central issue investigated was whether facial configuration or height is utilized by infants to respond differentially to children and adults. Five different strangers, a male and a female child, a male and a female adult, and a small…

The Seguin Form Board Test is used to assess visual discrimination and matching and eye-hand coordination. Previous analysis has shown the vactor loadings for the same scale to differ among age levels, so the test may be measuring different abilities at different age levels. Test materials consist of ten differently shaped wooden blocks and a…