Three families of anthropoid apes possess an important brain function connected with speech faculties. Earlier it was supposed this function to be exceptionally human brain’s prerogative. According to BBC, investigators from Atlanta, State Georgia, carried out a resonance-magnetic scanning of chimpanzee, baboon and gorilla’s brains. Now the scientists are sure nobody has investigated yet such an important structure of anthropoid apes’ brain. If their discovery is corroborated, it will become one more important contribution to the evolution theory: it will be clear that human being obtained speech faculty before homo sapience and other big primates’ ways dispersed forever. In human brain there is so-called Brock zone, whose one of the components is called Broadmann-44 zone. Namely this zone, situated mostly in the left cerebral hemisphere and partly in the right one, is responsible for forming speech. Claudio Cantalupo and William Hopkins from Georgia State University were puzzled with the fact that the apes also possessed this structure, though they could not speak. It is not clear for what functions the apes need this Brock zone, especially taking into account that the primitive anthropoid apes’ “language” is not similar to the complicated human speech. This could be explained only with the role gesticulation plaid in evolution of human speech. The anthropoid apes observed by the investigators most often gesticulated with their right hand, especially when they accompany their gestures with a kind of voice signals. If the scientists’ theory is right, the left side of the zone-44 was gradually enlarging, while both human predecessors and anthropoid apes were learning gesticulate and produce laryngeal sounds. Though later, by unknown reasons, human gestures and sounds grew into speech, while the apes’ ones remained the same gestures forever.
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