A stimulation apparatus for stimulating a brain of a person comprising: a first electrical stimulation signal generator, and a second sensory stimulation signal generator, a control unit adapted to: control the first signal generator of said stimulation apparatus to apply a generated electrical stimulation signal to a sensory organ of said person and control the second signal generator of said stimulation apparatus to apply a generated sensory stimulation signal to the sensory organ of said person, and a signal detector connected to said control unit, wherein said signal detector is adapted to detect a physiological signal being an electroencephalogram signal or a magnetoencephalogram signal which is generated by the brain of said person in response to the applied electrical stimulation signal or in response to the applied electrical stimulation signal and the applied sensory stimulation signal, characterized in that in a first operation mode of said stimulation apparatus the stimulation apparatus is adapted to vary a frequency (f) of the applied stimulation signal formed by the electrical stimulation signal or by both, the electrical and the sensory stimulation signal (ESS, SSS) applied by said first and second signal generator (8, 9) automatically in a predetermined frequency range (Δf), wherein said control unit is adapted to determine an optimal setting of the frequency (f) producing a maximum amplitude (A max) of the detected physiological signal by analyzing the physiological signal; and that in a second operation mode of said stimulation apparatus the stimulation apparatus is adapted to apply the electrical stimulation signal and the sensory stimulation signal via said first and second signal generator (8, 9) to the sensory organ with a frequency (f) being adjusted to the determined optimal setting of the frequency (f) forming an individual resonance frequency (f R) of said person. a first electrical stimulation signal generator, and a second sensory stimulation signal generator, a control unit adapted to: control the first signal generator of said stimulation apparatus to apply a generated electrical stimulation signal to a sensory organ of said person and control the second signal generator of said stimulation apparatus to apply a generated sensory stimulation signal to the sensory organ of said person, and control the first signal generator of said stimulation apparatus to apply a generated electrical stimulation signal to a sensory organ of said person and control the second signal generator of said stimulation apparatus to apply a generated sensory stimulation signal to the sensory organ of said person, and a signal detector connected to said control unit, wherein said signal detector is adapted to detect a physiological signal being an electroencephalogram signal or a magnetoencephalogram signal which is generated by the brain of said person in response to the applied electrical stimulation signal or in response to the applied electrical stimulation signal and the applied sensory stimulation signal, characterized in that in a first operation mode of said stimulation apparatus the stimulation apparatus is adapted to vary a frequency (f) of the applied stimulation signal formed by the electrical stimulation signal or by both, the electrical and the sensory stimulation signal (ESS, SSS) applied by said first and second signal generator (8, 9) automatically in a predetermined frequency range (Δf), wherein said control unit is adapted to determine an optimal setting of the frequency (f) producing a maximum amplitude (A max) of the detected physiological signal by analyzing the physiological signal; and that in a second operation mode of said stimulation apparatus the stimulation apparatus is adapted to apply the electrical stimulation signal and the sensory stimulation signal via said first and second signal generator (8, 9) to the sensory organ with a frequency (f) being adjusted to the determined optimal setting of the frequency (f) forming an individual resonance frequency (f R) of said person.