Fig. 1. Incidence of behaviors observed in the 2-h period before delivery of the first pup (Labor), during the time between delivery of the first and last pup (Delivery), and for 30 min after delivery of the last pup (Postdelivery) in rats receiving continuous intrathecal saline. Behaviors were divided as indicated in the text into general activities, phasic stretching activities, maternal attention activities, and expulsive efforts. Data are presented as median + 75th percentile.