[Individual behavior depending on reinforcement prediction errors and environmental uncertainty].

Different types of individual behavior are described in terms of under- or overestimation of reinforcement characteristics by the brain under conditions of uncertainty of reinforcement presentation. The following important biological characteristics of a subject are discussed, such as anxiety, fear, neuroticism, impulsiveness, self-control and psychoticism that determine the main individual-typological features in human and animals. Some modern biological theories of "individuality" and recent animal studies of neuronal activity of the frontal cortex and striatum depending on validity and delay of reinforcement are analyzed.