The document discusses several theories of emotions. It describes the Cannon-Bard Theory, which proposes that emotions provoking events simultaneously produce physiological arousal and subjective reactions. It also describes the James-Lange Theory, which suggests that emotion-provoking events produce physiological reactions and recognition of these leads to subjective emotions. Additionally, it outlines Schachter-Singer Two-Factor Theory, which proposes that our subjective emotions are determined by the cognitive labels we attach to feelings of arousal. It also briefly discusses the Opponent-Process Theory, suggesting any emotional reaction is followed by an opposite reaction and repeated exposure weakens the initial reaction.