A neurocomputer system for selecting commands based on recording brain activity, comprising: - an electroencephalograph; - electrodes configured to transmit detected pulses; - an electronic computing device for analyzing the recorded brain activity; and - a visual stimulus module that includes a screen displaying a visual stimulus environment, the visual stimulus environment including switching control elements and control elements, the control elements being at least two, the visual stimulus module being provided with the possibility of creating visual stimuli, the visual stimuli being short-term modifications of the control elements and of the switching control elements displayed on the screen, the short term modifications of the control elements being at specific frequencies, each control element being associated with a corresponding target command, the neurocomputer system being characterized in that: - the control elements are divided into at least two groups, each of said groups consists of at least one control element and has a corresponding switching control element of said switching control elements, said corresponding switching control element being associated with a command, the command being to simultaneously initiate the creation of visual stimuli for all control elements in the group to which the corresponding switching control element belongs to, and to disable the creation of visual stimuli for all control elements contained in the other groups of said at least two groups, except the creation of visual stimuli for the switching control elements of each of said other groups; and, - the creation of visual stimuli for the control elements is organized in the course of selecting commands in the form of repeating cycles involving consecutive creation of the same visual stimuli for each of the control elements, and for selecting one target command, at least, one cycle of stimulation is used, while for selecting the command associated with the switching control element of each of the groups, a continuous creation of visual stimuli with frequencies that differ from the specific frequencies of visual stimuli of the control elements is implemented, and additionally the system detects whether there happens a fixation of the user's look in a zone of visual stimulus wherein a given switching control element is located. - an electroencephalograph; - electrodes configured to transmit detected pulses; - an electronic computing device for analyzing the recorded brain activity; and - a visual stimulus module that includes a screen displaying a visual stimulus environment, the visual stimulus environment including switching control elements and control elements, the control elements being at least two, the visual stimulus module being provided with the possibility of creating visual stimuli, the visual stimuli being short-term modifications of the control elements and of the switching control elements displayed on the screen, the short term modifications of the control elements being at specific frequencies, each control element being associated with a corresponding target command, - the control elements are divided into at least two groups, each of said groups consists of at least one control element and has a corresponding switching control element of said switching control elements, said corresponding switching control element being associated with a command, the command being to simultaneously initiate the creation of visual stimuli for all control elements in the group to which the corresponding switching control element belongs to, and to disable the creation of visual stimuli for all control elements contained in the other groups of said at least two groups, except the creation of visual stimuli for the switching control elements of each of said other groups; and, - the creation of visual stimuli for the control elements is organized in the course of selecting commands in the form of repeating cycles involving consecutive creation of the same visual stimuli for each of the control elements, and for selecting one target command, at least, one cycle of stimulation is used, while for selecting the command associated with the switching control element of each of the groups, a continuous creation of visual stimuli with frequencies that differ from the specific frequencies of visual stimuli of the control elements is implemented, and additionally the system detects whether there happens a fixation of the user's look in a zone of visual stimulus wherein a given switching control element is located.