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Sequence of the stimuli: two short grave notes anticipate the musical stimulus; two short grave notes and one long acute note at an interval of 5th anticipate the noxious stimulus. From Sequence (A) 1 to 7 the stimuli were associated to the tones; the eighth without stimulus administration to verify the CR; Sequence (B) from 9 to 16 only tones for the extinction of the stimulus.
