— Carl Gustav Jung Médecin psychiatre suisse qui crée la psychologie analytique 1875 - 1961
Another thing that struck me was the great influence of the Negro, a psychological influence naturally, not due to the mixing of blood. The emotional way an American expresses himself, especially the way he laughs, can best be studied in the illustrated supplements of the American papers; the inimitable Teddy Roosevelt laugh is found in its primordial form in the American Negro. The peculiar walk with loose joints, or the swinging of the hips so frequently observed in Americans, also comes from the Negro. American music draws its main inspiration from the Negro, and so does the dance. […] The vivacity of the average American, which shows itself not only at baseball games but quite particularly in his extraordinary love of talking - the ceaseless gabble of American papers is an eloquent example of this - is scarcely to be derived from his Germanic forefathers, but is far more like the chattering of a Negro village. […] Thus the American presents a strange picture: a European with Negro behaviour and an Indian soul.