Emotion is a feeling evoked by environmental stimuli or by internal body states, which modulates human behavior in terms of actions in the environment or changes in the internal states of the body. The idea of emotional expressions was first recognized by Darwin, who discovered that the natural selection process is not only applicable to anatomic patterns but also can be applied to animal behavior and mind. Emotion is a vital part of human behavior, which is derived from a Latin word which means “move”. It depends on the influences of the external factors such as interaction with people and environmental conditions. In interactive cognitive environments, the evolution of smart spaces is defined by the ambient intelligence paradigms.