Emotions, affects and humor play an important part in psychopathology. This study describes the definition of these different terms as well as their psychological concepts. Concerning quantitative psychopathology, the available scales of evaluation of affects or emotions are destinated to evaluate the subjective compound of the emotions, depressive humor, seek for sensations, pleasure or anhedonia. They all have the same aim: the evaluation, in a subjective way, of the basic affectionate state of the subject at a precise moment in his life. The subject's affectionate reactivity to external emotional stimulations can also be studied using different methods of emotional inductions. These methods can be applied in a psychopathological as well as in a pharmacological point of view.