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Individual values of heart frequency recorded in healthy university students while listening to tonal or atonal musical pieces. The latter condition was associated with a pronounced bradycardia (represented by a more extended green and yellow area). AGIT-AT = atonal agitating; JOY-AT = atonal joyful; SAD-AT = atonal touching; AGIT-T = tonal agitating; JOY-T = tonal joyful; SAD-T = tonal touching.
