Table 1.

Stimulation parameter set for the three parallel arms

	Auditory stimulation	Temporal relationship with somatosensory stimulation
Arm 1	Sequence of tones mixed with a broadband noise that is spectrally modified to compensate for any hearing loss	Somatosensory pulses are synchronised with the tones
Arm 2	Sequence of tones mixed with a broadband noise that is spectrally modified to compensate for any hearing loss	Somatosensory pulses are temporally aligned with the tones with varying short delays
Arm 3	Sequence of tones mixed with a broadband noise with the spectral range outside the regions normally associated with sensorineural hearing loss	Somatosensory pulses are temporally aligned with the tones with varying long delays