Voluntary human movements are realized through the interaction of various brain structures that make their own specific contribution to the construction of movement. The defeat of any of these structures, combined in a complex functional system, leads to a violation of the normal organization of the motor act. One of the methods of studying voluntary movement is «movement-related brain potentials» (MRBP) -short-term shifts of biopotentials that occur in the human brain a few seconds before the

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... tart of movement and at the time of its implementation. It is known that the MRBP components reflect different phases of both preparatory processes and processes related to the implementation of motor commands and subsequent adjustment of the motor task. In patients with brain damage, reduced spontaneity of behavior is manifested by the inability to perform even a simple voluntary movement. With pronounced spontaneity, the patient can involuntarily repeat the movement after the instructor, but does not have its own incentive mechanism for voluntary movement. The level of motivation and readiness to perform any movement are reflected in the amplitude-time parameters of the readiness potential, which can be, in conjunction with other pre-motor components of the MRBP, an electrophysiological marker of spontaneity when performing a motor task. The present study is aimed at searching for electrographic correlates of spontaneity when performing an arbitrary movement. It is shown that these can be the pre -motor components of the MRBP (N1 -early and N2-late phase of the readiness potential), which are an electrophysiological reflection of the processes of preparing and starting the movement.