. The causes and course of organic evolution; . d ^ Fig. 9—Comparative diagrammatic stages in development of the frontbrain or neencephalon, in (a) Selachian, (6) Amphibian, (c) Reptile, (<:/) Mam-mal, in each case shown in black. (After Edinger.) truly be regarded as a receptor for discrete simple or result-ant stimuli, as a condensor and correlator of these into complexor summated perceptions, as a storage center for these per-ceptions, and particularly as a great proenvironal activator,from which extremely varied and often complexly summatedefferent stimuli proceed. It is not necessary t
. The causes and course of organic evolution; . d ^ Fig. 9—Comparative diagrammatic stages in development of the frontbrain or neencephalon, in (a) Selachian, (6) Amphibian, (c) Reptile, (<:/) Mam-mal, in each case shown in black. (After Edinger.) truly be regarded as a receptor for discrete simple or result-ant stimuli, as a condensor and correlator of these into complexor summated perceptions, as a storage center for these per-ceptions, and particularly as a great proenvironal activator,from which extremely varied and often complexly summatedefferent stimuli proceed. It is not necessary therefore at present that an attemptshould be made further to trace examples of proenvironalreaction as a great evolutionary factor that has worked through- Law of Proenvironment 24 1 out the entire series of the higher Metazoa. For most of thiresponses or actions shown by such animals are wholly dueto efferent proenvironal stimuli which start as summatedresponses to simpler stimuli that have passed in from ^^thout,and which guide—we might
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