Shared attention refers to episodes through which a child and his or her caretaker are intentionally focused on some object or activity while engaging in physical and emotional exchange. This study describes shared attention bearing in mind levels of commitment and emotional tone, and it analyzes associated relationships with maternal sensitivity and the intensity of emotional expression in one-year-old children. The sample includes 12 mother-child dyads with the following inclusion criteria: only children, of ages between 12 and 14 months, living with both parents and attending a nursery. The instruments used were the Shared Attention Assessment, the Children's Emotional Expressions Assessment, and the Adult Sensitivity Scale (ASS). Results show episodes of shared attention between mother-child dyads at one year of age. A significant relationship between shared attention, levels of commitment, and maternal sensitivity was also found.