An exploratory study of high-risk mothers' interactions with their infants studied modalities of stimulation; vestibular and auditory. It was hypothesized that stimulation would be lower for non-paranoid than for paranoid types, and than for control mothers. Mothers recruited from inner city gynecological clinics were screened for probable schizophrenia by the Schachter Scale. They were then judged clinically as to Paranoid Personality Disorder (Paranoids), other Schizoid Personality Disorder (Non-Paranoid) and low psychopathology (Controls). These clinical diagnoses were then verified by three Rorschach indicators, which significantly differentiated the groups. Three groups of five control, two non-paranoid, and two paranoid subjects, repsectively were compared as to their stimulation of their infants at 4, 5, and 6 weeks of age. Findings indicate that Paranoid Personality disordered mothers stimulate their infants more than Non-Paranoids and more than Controls. The expectation that Non-Paranoids would stimulate infants less than Controls is not supported by the data; however, this result appeared to be due to the effect of one extremely anxious, restless mother. Differences between groups were highlighted when mothers were alone with their infants. (Author/CL)