An apparatus for use in treating a neurological disorder of the auditory system, including a stimulus generation unit and a somatosensory stimulation unit. The stimulus generation unit operable to analyse an audio signal including a first component comprising a broadband or white noise component and a second component including a plurality of complex tone bursts, and generate a plurality of actuation signals representative of at least one of the first or second component of the audio signal and further to spectrally modify the audio signal to generate a binaural modified audio signal for delivery to a subject. The somatosensory stimulation unit includes: an array of stimulators to apply a somatosensory stimulation to the subject with the modified audio signal, and an input for receiving the plurality of actuation signals from the stimulus generation unit and directing individual actuation signals in a predetermined pattern to individual stimulators in the array.