Аннотация:The study of intellectual capabilities of people, such as the states ofperception, attention, memory, and thought, is becoming more and moretopical, especially in view of the growing significance of the role of braincognitive properties in its various functional conditions and during organicdisorders. One of the forms of brain cognitive processes that characterizethe level of person’s intellectual capabilities is considered to be its ability toadequately predict the events in external environment and also the choice ofrational behavioral strategy (1, 2). The phenomenon of probability predictionand its individual peculiarities in humans are usually studied through the useof a commonly accepted method – the “guessing game”. This method consistsin the following: the subjects is offered to predict the appearance of the nextsignal out of two or more alternative options, presented in a random sequencewith a preliminarily specified probability correlation in a certain way (forexample, by pushing corresponding buttons).