[Relationship between different types of memory in animals after a long stay in a changed gaseous environment]. / Sootnoshenie razlichnykh vidov pamiati u zhivotnykh posle dlitel'nogo prebyvaniia v izmenennoi gazovoi srede.

Male rats were kept for ten days in helium-oxygen mixtures (PO2=0.2, 0.4 and 0.6 kgf/cm2) at atmospheric and higher (30 kgf/cm2) pressure, as well as in nitrogen-oxygen mixtures (PO2 = 0.2 and 0.6 kgf/cm2) under pressure (5 kgf/cm2). After the animals left the chamber their conditioned activity was investigated by the active avoidance method. The stay in a normoxitic helium-oxygen mixture under atmospheric or higher pressure did not affect conditioning, but after exposition in a normoxitic nitrogen-oxygen mixture under pressure, the rats exhibited a retarded elaboration of the conditioned reflex. A rise in partial oxygen pressure in the mixtures affected unfavourably the process of conditioning.