This monograph is a collection of papers describing a series of loosely related studies of visual attention, auditory stimulation, and language discrimination in young infants. Titles include: (1) Infant Attention and Discrimination: Methodological and Substantive Issues; (2) The Addition of Auditory Stimulation (Music) and an Interspersed Stimulus Procedure to Control Visual Attending Behavior in Infants; (3) The Effects of Variations of Auditory Stimulation (Music) and Interspersed Stimulus Procedures on Visual Attending Behavior in Infants; (4) The Use of the Mother's Voice to Control Infant Attending Behavior; (5) Infant Control and Response Decrement and Recovery as an Index of Visual Discrimination in Young Infants; (6) Visual Fixation and Voice Discrimination in Two-Month-Old Infants; (7) Visual Fixation and the Effect of Voice Quality and Content Differences in Two-Month-Old Infants; and (8) Discussion and Conclusions (based on the preceding papers). An appendix presents principles and procedures in the operation of an infant experimental research laboratory. (Author/SB)