Changes in perceptual asymmetry between the premenstrual and postmenstrual phases of the menstrual cycle were assessed in 39 women. Perceptual asymmetry was measured with fused, single response dichotic listening tests. The usual right ear advantage (REA) for auditory language-related stimuli was significantly greater in the postmenstrual phase of the cycle. Subjects with repressive personality styles were less likely to show a change in REA with the cycle. These neuropsychological findings are related to previously described physiological and psychological features of the menstrual cycle and the repressive personality style.