Two hundred pregnant women were asked, before and after child delivery, to fill out a questionnaire about their feelings during pregnancy and childbirth. A day after delivery, they filled out the revised repression‐sensitization (R‐S) scale (Byrne, Barry, and Nelson, 1963). Results of the study showed four factors in the women's feelings during pregnancy and child delivery: (1) feelings of pain and anxiety during pregnancy, as well as evaluation of the pain they had suffered during delivery; (2) anxiety in the labor room; (3) fear of giving birth to a defective child: and (4) pain in the labor room. Repressors scored lower on the first three‐factors than sensitizers; no significant differences were found between them in the fourth factor. Repressors also indicated that the birth pangs would influence them to postpone their next pregnancy to a lesser extent than did sensitizers. However, both indicated the same actual length of waiting time till their next pregnancy. A possible difference in time perspective between the two groups was suggested to explain this apparent inconsistency. Results also showed that primiparae scored lower on the first factor and higher on the fourth factor than did muitiparae.

A group of 177 women were asked, before and after child delivery, to state their preference for being alone or with other women. They were also asked to rank their level of anxiety. After delivery they filled out the Repression-Sensitization Scale of Byrne, Barry & Nelson (1963). Results show sensitizers to be more anxious than repressors before but not after delivery. Before delivery repressors preferred to be alone, while sensitizers wanted to stay with others. After delivery both groups show a significant preference for being with others. There is no significant correlation between anxiety and affiliation.

The relationships among body weight, cerebellum weight, cerebrum weight, maze-learning ability in a double T-maze, and discrimination learning in a Y-maze were studied in six inbred strains of mice and some of their F1 hybrids. The subjects were 131 male albino mice from 14 genotypic groups: five inbred groups and nine groups of crossbred offspring. Intra- and intergroup correlations were computed between all possible pairs of the anatomical and behavioral traits. A significant difference between the intragroup and intergroup correlations for any pair of variables was taken to indicate the presence of a genetic correlation between the two variables. On this basis, positive genetic correlations were indicated between T-maze learning ability and Y-maze learning ability, between body weight and T-maze learning ability, and possibility between body weight and both cerebellum and cerebrum weight and between cerebrum weight and T-maze learning ability. Negative genetic correlations were indicated between cerebellum weight and running time in both mazes and between total number of successes in the Y-maze and Y-maze running time.