Mean duration in s that previously separated and non-separated guinea pig pups spent immobile, climbing, and swimming; and median latency in s for pups to become immobile, during each of 3 days of forced swim, as well as averaged across all 3 days (histograms). Standard errors of the means are indicated with vertical lines. Box and whisker plots indicate the 10th, 25th, 50th, 75th, and 90th percentiles. Changes across days were significant for immobility duration, immobility latency, and swimming duration. *p < .05 versus NSEP