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Animals with high, low and medium resistance to hypoxia were selected by repetitive tests under a vacuum bell. It has been shown that most rats with high resistance to hypoxia are characterized by strong basic nervous processes. The majority of animals with low resistance and all the animals with medium resistance to hypoxia exhibit signs of the weak type higher nervous activity.

Alimentary conditioned reflexes in the form of pressing (with an effort not less than 600 g) with a fore-leg on the pedal of a nearby feeding-trough, were elaborated by means of classical secretory technique in 15 dogs with defined typological characteristics of the higher nervous activity. The motor habit was formed in about a half of the animals. The ability to instrumental learning was assessed on a five-points scale in accordance with four stages of habit formation. The study revealed an absence of direct dependance between the obtained typological characteristics of the animals and their ability to instrumental conditioning.