Research of the law of rats allocation in open field on a level of an entropy of behaviour has shown, that all array is parted on four distinguishing bunches. The comparison of average values of a vascular reactivity on bunches has not revealed authentic differences in a reactivity of an abdominal aorta to augmentation of a flow rate. The method of account research of linear and not linear didymous correlation detects positive connection between parameters of a "data-flow" accretion (%) and "entropies of behaviour" of rats.

The factor connecting behaviour of animals to a vascular reactivity is the initial diameter of arteries. It is possible, that other connecting factors can be the separate behavioural acts or internal factors, their defining.