Mental states or feelings associated with evaluation of experiences. States generated by evaluations or appraisals of environment. Differ from other feelings such as mood. Components can occur without other components in emotional experiences. 6-10 basic emotions that include physiology and expressive behavior. Theories of emotion generally address two major questions. James-lange theory (1890): arousal comes before emotion. Experience of emotion involves awareness of physiological responses to emotion-arousing stimuli. Arousal component of emotion is regulated by autonomic nervous system"s sympathetic and parasympathetic divisions. Altercation of facial expression can lead to change in subjective experiences of emotion. Facial expressions related to other components of emotions. Feedback from facial muscles generates emotional experiences. You feel happy because you smile instead of you smile because happy. Bodily reactions slower than emotions and similar body reactions can occur for different emotions. Arousal and emotion happen at same time. Arousing stimulus simultaneously trigger physiological responses and subjective experience of emotion.