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The third volume of this well known treatise deals with those psychic functions which are ordinarily called sensorimotor and among which are customarily included orientation, equilibration, expression of emotion, mimicry and language. These differ from the primary sensory and motor functions in that they involve multiple sensory and motor pathways, which have already special functions, and impose on them secondary systematizations. The first section, dealing with equilibrium and orientation, is essentially a detailed summary of the work of the Magnus-de Kleijn and Sherrington schools of neurophysiology. The discussion of the emotions begins with a historical account of the work of Spencer, Darwin, Duchenne and others, followed by a detailed description of the external expression of various preliminary and special emotions, with numerous illustrations. One may note the interesting analogy given by the author between the effects of stimulation of the facial nerve and the expression of joy, and the effects
Nouveau Traité de Psychologie. JAMA. 1934;102(10):795. doi:10.1001/jama.1934.02750100061032