The invention relates to a method and to an apparatus for electrostimulation of a test subject (3), wherein a number of electrodes (21) are placed on the brain (31) of a test subject, wherein the voltages present on the individual electrodes (21) are measured and analyzed after the delivery of the stimulus, wherein during a preselection based on said analysis, individual electrodes (21) are selected for the delivery of a stimulus, wherein one electrode (21) is selected from the individual preselected electrodes (21) and a stimulus is delivered to the brain (31) by means of said electrode (21). According to the invention, in the analysis using the measurement signals (M) during the preselection, the signals present on the electrodes (21) are examined, in particular exclusively examined, for the presence of signal power or signal energies in the range from 60 Hz to 1k Hz, in particular between 60 Hz and 180 Hz.