Somatosensory A-waves (somA-waves) compared with visA-waves and audA-waves in the same subject. A: A single visA-wave run, stimulating the left hemifield. B: audA-waves at two different rates. Monoaural stimulation in right ear, Dau-chirps at 45 dBSL. C: somA-waves from right median nerve stimulation sufficiently strong to cause thenar muscle contraction. Replicate runs are shown at two different rates. Note: this male subject was 74 yrs old, and had some high-frequency hearing loss.