Neurophysiological mechanisms of retardation of arbitrary movements of persons of young and mature age with various levels of attention, impulsivity and hyperaptivity

The dynamics of excitability of the motor cortex of juvenile and mature adults who were both healthy research subjects and persons with attention deficit and impulsivity with hyperactivity disorder in the course of realization and refusal of movement in response to the inhibitory signal using the methods of transcranial magnetic stimulation and electroencephalography has been studied. The comparative analysis of averaged topographic maps at rest with closed eyes and with psychoemotional strain of the research subject who was waiting for a resolving or an inhibition signal for the execution of an arbitrary movement has been conducted. It was found that the maximal values of the induced motor responses among persons with impulsivity disorder with hyperactivity were greater than among the healthy ones. When the motion was executed in response to a significant stimulus, the amplitude of the induced potential increased, the latent period decreased among all research subjects in comparison with the resting state...