Abstract: In this article, the author begins by recalling the hyperbolic partial differential equations in order to introduce the wave equation. If in the article [2], a uni-dimensional solution has been detailed, then, in this article, the author is interested in the 3-dimensional solution. Finally, the article presents the pattern of the birth of emotions in the human brain from stimuli. The article [5] is concluded with a question: can we learn emotions differently? In this article, we put the question to a psychologist.