Electroretinography, a simple, bloodless technique commonly used in ophthalmological diagnostic practice, seems to give important informations on the level of activity of the retinal and/or other central dopaminergic systems. The Authors have employed this technique in a group of 30 normal pregnant women in the ninth month of gestation, in order to evaluate the dopaminergic activity in a condition of physiological hyperprolactinemia, such as pregnancy, and in a group of 25 normal nonpregnant control women. The b wave amplitude of the electroretinographic traces was significantly higher in pregnant women than in controls, suggesting an over-activity of dopaminergic systems in late pregnancy. The possible interpretations of these data are discussed.