People with long-term pain frequently display psychological disturbance, with elevated scores on the Minnesota Multiphasic Personality Inventory scales of hysteria, depression and hypochondriasis (the "<answer>neurotic</answer> triad"). Some investigators have argued that it is this <answer>neurotic</answer>ism that causes acute pain to turn chronic, but clinical evidence points the other way, to chronic pain causing <answer>neurotic</answer>ism. When long-term pain is relieved by therapeutic intervention, scores on the <answer>neurotic</answer> triad and anxiety fall, often to normal levels. Self-esteem, often low in chronic pain patients, also shows improvement once pain has resolved.
What triad are the inventory scales of hysteria, depression and hypochondriasis classified as?
neurotic