1. A device for desynchronizing a patient's neuronal brain activity involving a neuron population firing in a pathologically synchronized manner, the device comprising: a stimulation unit configured to generate an acoustic stimulation signal comprising at least a first tone and a second tone; wherein the first tone comprises a first frequency or first frequency mixture in a first frequency range and is configured to shift the phase of the neuronal brain activity of a first subpopulation of the neuron population relative to the phase of the neuronal brain activity of a second subpopulation of the neuron population when the first tone is acoustically received by the patient; wherein the second tone comprises a second frequency or second frequency mixture in a second frequency range different than the first frequency range and is configured to shift the phase of the neuronal brain activity of the second subpopulation relative to the phase of the neuronal brain activity of the first subpopulation when the second tone is acoustically received by the patient; and wherein the acoustic stimulation signal desynchronizes the neuron population of the patient when the acoustic stimulation signal is acoustically received by the patient.