MAN 



Human Horizon 



ORANG 



MVCETES 



CHIMPANZEE -««:j^ ^^ GORILLA 



Antliiopoicl Horizon 



GIBBON 



Proanthropoid Horizon 



MACACUS BABOi 



Simian Horizon 



TARSIUS LEMUR 



Lemuroicl Horizon 



FIG. 45(). PRINCIPAL PRIMATE HORIZONS, SHOWINC THE EXOLLTIONAL 

 I EXPANSION OF THE NEOPALLIUM. 

 The original drawiiifj reproduced tlu' actual size of each brain depicted; in this figure each brain is 

 reduced to two-sevenths actual size. The progressive expansion of the psycliic area (blue) is clearly 

 demonstrated in ascending from tarsius to man. 



Key: Blue, Psycl\ic Region; Red. Motor Region; Green, Sensory Region; \'ello\v, Visual Region; Gray, 

 Auditory Region; Red and Blue, Speech Area. 



I989I 



