1. An apparatus ( 1 ) for stimulating neurons with a pathologically synchronous and oscillatory neural activity, comprising a stimulation unit ( 11 ) having a plurality of stimulation contacts ( 25 - 28 ) for stimulating neurons in at least one of a brain and a spinal cord of a patient using electrical stimuli ( 22 ); a measuring unit ( 12 ) for recording measured signals ( 23 ), the measured signals reproducing a neural activity of the stimulated neurons; and a control and analysis unit ( 10 ) for controlling the stimulation unit ( 11 ) and for analyzing the measured signals ( 23 ), wherein the control and analysis unit ( 10 ) is configured such that it controls the stimulation unit ( 11 ) such that the stimulation contacts ( 25 - 28 ) apply stimuli ( 22 ); selects the stimulation contacts ( 25 - 28 ), whose stimuli ( 22 ) effect a phase reset of the pathologically synchronous and oscillatory neural activity of the stimulated neurons, with reference to the measured signals ( 23 ) recorded in response to the application of the stimuli ( 22 ); controls the stimulation unit ( 11 ) such that the selected stimulation contacts ( 25 - 28 ) apply phase resetting stimuli ( 22 ) with a time offset; and checks with respect to the measured signals ( 23 ) recorded in response to the phase resetting stimuli ( 22 ) applied with a time offset whether the phase resetting stimuli ( 22 ) applied with a time offset suppress the pathologically synchronous and oscillatory neural activity of the stimulated neurons.