Radiator Theory

A theory that explains how the human brain evolved from a 500-gram chimpanzee-like brain in early hominids to the current size of ± 1400 gram in less than 2 million years—a very short time span in evolutionary biology. Per Falk’s theory, selection for habitual bipedalism in early hominids necessitated a reconfiguration of the cranial vascular supply in response to changes in hydrostatic pressure. The critical event that allowed Australopithecus (and not Parathropus) to survive bipedalism was development of the emissary venous network
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Into this murky milieu strides Falk with her radiator theory, which manages to stoke ongoing debates in both anthropology and physiology.
The radiator theory attracts criticism from anthropological quarters as well.
Right or wrong," says Scheibel, the radiator theory "is not likely to be forgotten.