El-マウスの飼育環境または振とう条件 (動物群集心理学の薬理学への導入-9,10-)

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Rearing circumstances and shaking conditions were considered from the standpoint of behavioral-scientific pharmacology concerning El-mice-convulsion. Rate of non-convulsion (RNC) and threshold of shaking-number for convulsion (TSC) were used as indexes, and results are as follows. (1) The area of living space had no direct influence on TSC or RNC. (2) RNC increased markedly when each mouse was reared in an isolated condition, as compared to those in groups. This increase of RNC as seen with isolation recovered to the control level when the mice were re-grouped again. RNC in grouped mice was hardly influenced by the number of mice in one cage, i.e. 2, 5, 10 or 12. (3) When each El-mouse was reared with 1 or 7 dd-mice, the RNC of El-mice increased remarkably as compared to the case of rearing only El-mice together. The RNC also recovered when the El-mice were grouped. (4) Relation between TSC or RNC and the environmental temperature was studied. Both TSC and RNC increased at 8°C, but at 30_??_34°C hardly differed from those placed in a 22_??_26°C situation. (5) TSC increased with the increase of shaking-frequency, cycle/min, but the time, that is seconds until El-convulsive seizure was observed, hardly differed. Induction of El-convulsion was prevented when the shaking movement was stopped midway.