What, now, do these observations teach us concerning the origin of gesture-language, and therefore probably also concerning the factors underlying the origin of language in general? According to the popular notion, a so-called impulse for communication or, perhaps, certain intellectual processes, voluntary reflections, and actions, account for the fact that the contents of one's own consciousness come to be communicated to other individuals. If, however, we observe gesture-language in its origin, we obtain an entirely different view. This mode of communication is not the result of intellectual reflections or conscious purposes, but of emotion and the involuntary expressive movements that accompany emotion. Indeed, it is simply a natural development of those expressive movements of human beings that also occur where the intention of communicating is obviously absent. As is well known, it is not only emotions that are reflected in one's movements, particularly in mimetic movements of the face, but also ideas. Whenever ideas strongly tinged with feeling enter into the course of emotions, the direct mimetic expressions of the face are supplemented by movements of the arms and hands. The angry man gesticulates with movements which clearly indicate the impulse to attack that is inherent in anger. Or, when we have an ideational process of an emotional nature, and ideas arise referring to objects that are present to us, we point to the objects, even though there be no intention of communicating the ideas. Directions in space, likewise, as well as past time and futurity, are involuntarily expressed by means of backward and forward pointing movements; 'large' and 'small' are expressed by the raising and lowering of the hands. When further movements are added, indicating the form of an object by describing its image in the air with the hands, all the elements of a gesture-language are complete. What is lacking is only that the emotionally coloured idea be not a mere expression of one's own emotion, but that it evoke the same emotion and, through this, the same idea, in the minds of others. Under the influence of the emotion aroused within them, those addressed must then reply with the same, or slightly different, expressive movements. When this occurs, there is developed a common thinking in which impulsive movements are more and more displaced by voluntary actions, and ideational contents, together with the corresponding gestures, enter into the foreground of attention. By virtue of this ideational content, movements expressive of emotions come to be expressions of ideas; the communication of an individual's experiences to others results in an exchange of thought--that is, in language. This development, however, is influenced by that of all the other psychical functions, and especially by the transition of emotional and impulsive movements into voluntary actions.