An experiment with monochromatic lights is discussed in terms of the selective effects of wavelength on looking time and pleasantness, comparisons of infant and adult data, and differentiation of the selective effects of color category centers and color category boundaries. (JMB)

Two experiments were conducted to demonstrate that human infants 3 months of age perceive color in a normal, trichromatic manner. Results from these studies of the neutral zone and hue discrimination evidence trichromatic vision in infancy and are discussed in the context of their clinical, social, and intellectual implications. (Author/SB)

Two variants of the habituation paradigm were used to investigate fine orientation discrimination and shape constancy in 34 young infants. Results demonstrate that conditions determine whether young infants show sensitivity to relatively fine variations in pattern orientation or give evidence of shape constancy with the same patterns. (HOD)

Four experiments assessed converging aspects of four-month-old infants' perceptions of visual patterns. Results together corroborate and extend previous findings that vertical symmetry has a special status in early perceptual development and that infants can perceive pattern wholes. (Author/AS)