1. A device for desynchronizing a neuronal activity, the device comprising: a first stimulation unit configured to produce electrical first stimuli that suppress pathologically synchronous activity of neurons in at least one of a brain and a spinal cord of a patient; a second stimulation unit configured to produce second stimuli that are at least one of optical, acoustic, tactile and vibratory stimuli; and a control unit configured to control the first and the second stimulation units to produce the first and second stimuli in a first or a second mode of operation, wherein, in the first mode of operation, the control unit is configured to actuate the first and second stimulation units such that at least 60% of the second stimuli are produced during a time that the first stimuli are produced, and wherein, in the second mode of operation, the control unit is configured to actuate the first and second stimulation units such that at least 60% of the second stimuli are produced during a time that the first stimuli are not produced.