Objective: The objective of the study was to evaluate neurocognitive function in preeclampsia and normal pregnancy. Study design: Three groups(each n=15)were studied before and after delivery using standard neurocognitive test techniques. Group A consisted of normal laboring patients; group B, preeclamptics receiving magnesium; and group C, women in preterm labor receiving MgSO4 tocolysis(Mg control). The tests, examining attention, working memory, explicit memory, auditory comprehension, and measures for emotional distress, pain, and fatigue were analyzed via 4-way multivariate analysis of variance and multiple t tests. Results: Preeclamptics receiving MgSO4 had better attention and working memory(P=.05), compared with normal laboring women and the preterm patients. Explicit memory was impaired in all groups, and this could not be accounted for by pain or emotional distress. Conclusion: We could detect no cognitive defects in preeclamptics, compared with normotensive gravidas, at least while the cerebral vasodilator MgSO4 is being infused. Objective: The objective of the study was to evaluate neurocognitive function in preeclampsia and normal pregnancy. Study design: Three groups (each n = 15) were studied before and after delivery using standard neurocognitive test techniques. Group A consisted of normal laboring patients; group B, preeclamptics receiving magnesium; and group C, women in preterm labor receiving MgSO4 tocolysis (Mg control). The tests, examining attention, working memory, explicit memory, auditory comprehension, and measures for emotional distress, pain, and fatigue were cut- 4-way multivariate analysis of variance and multiple t tests. Results: Preeclamptics receiving MgSO4 had better attention and working memory (P = .05), compared with normal laboring women and the preterm patients. Explicit memory was impaired in all groups, and this could not be accounted for by pain or emotional distress. Conclusion: We could detect no cognitive defects in preeclamptics, compared with normotensive gravidas, at leas t while the cerebral vasodilator MgSO4 is being infused.