THIRTEEN FIGURESThis study was undertaken in effort to analyze in part, some of the factors controlling bacterial growth rates, and the action of quinine as an inhibitor of the over-all process. P a rticular emphasis has been placed on temperature, because of the theory and relationships discussed in the preceding papers (Johnson and Lewin, '45; '46a, b) and the literature referred to therein. The effects of coenzyme have been included inasmuch as the addition of coenzyme may greatly influence not only the activity of certain dehydrogenase systems, particularly in glucose dehydrogenation (Yudkin, '33, '34) but also the inhibitory action of quinine on these systems (Johnson and Lewin, '46a). METHODS

This study examined the emotional changes that occur during the trimesters of pregnancy. Two hundred eighty‐two women were asked, one day after giving birth, to indicate at what frequency they had experienced various symptoms during each trimester of pregnancy and to fill out the Repression Sensitization scale (Byrne, Barry, & Nelson, 1963). Results showed that while women's feelings during the first trimester are characterized by symptoms related to physiological changes (e.g., nausea, vomiting, dizziness), during the last trimester anxiety and emotional distress become the most significant symptoms. The level at which these symptoms were experienced was affected by the subject's socioeconomic level, number of previous births (primaparae or multiparae), and her personality type (repressor or sensitizer).

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Based on the assumption that the mental aspect of REM sleep is an extreme state of divergent thinking, it was hypothesized that the psychological effect of REM deprivation varies on a dimension of creativity versus rote learning. On the creativity pole, REM deprivation has a damaging effect, while on the rote learning pole, it has a beneficial effect. The subjects (.Ss) were 12 male undergraduate students. Each spent 3 nights in the laboratory. Ss served us their own controls, with 5 days separating the REM deprivation and the non‐REM deprivation nights. Before going to bed, each of the Ss was given 4 tasks, on which testing took place the fallowing morning. Comparable tasks, in a balanced design, were used on the REM deprivation and on the non‐REM deprivation nights, The tasks given were: (a) serial memory, (b) “clustering” memory, (c) word fluency, and (d) Guilford's Utility Test. Results showed a significant decrement in creativity (the Guilford's Utility Test), and a significant increment in role memory (the serial memory task), due to REM deprivation. No significant differences were found for the other 2 tasks used, which were somewhere in‐between the two extreme poles of creativity and role learning. These results might explain earlier, contradictory findings in this area. These results lend further support to the general assumption that REM sleep is used by the organism for internal information processing. However, an additional assumption has to be. made, that this processing is divergent and not convergent.

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