ABSTRACT
The purely affective reaction of a lower organism or of a mammal deprived of its cerebral cortex, consists, in accordance with the nature of the affect, of defence or pursuit which is very poorly adapted to the excitation. But the flexible and varied conduct of the higher animals and of man shows a very precise adaptation to extraordinarily numerous excitations; there is an enormous multiplicity of different acts. Reactions thus specifically adapted to definite objects are reactions of a perceptive nature.
