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  2. Brain size - Wikipedia

    en.wikipedia.org/wiki/Brain_size

    From early primates to hominids and finally to Homo sapiens, the brain gets progressively larger - with the exception of extinct Neanderthals whose brain size exceeded that of modern Homo sapiens. The volume of the human brain has increased as humans have evolved (see Homininae), starting from about 600 cm 3 in Homo habilis up to 1680 cm 3 in ...

  3. Cerebral rubicon - Wikipedia

    en.wikipedia.org/wiki/Cerebral_rubicon

    The minimum cranial capacity for the species Homo sapiens is generally set at 900cc. [1] One of the reasons for the proposal to exclude Homo habilis from the genus Homo, and renaming it as "Australopithecus habilis", is the small capacity of their cranium (363cc -600 cc).

  4. List of animals by number of neurons - Wikipedia

    en.wikipedia.org/wiki/List_of_animals_by_number...

    The human brain contains 86 billion neurons, with 16 billion neurons in the cerebral cortex. [ 2 ] [ 1 ] Neuron counts constitute an important source of insight on the topic of neuroscience and intelligence : the question of how the evolution of a set of components and parameters (~10 11 neurons, ~10 14 synapses) of a complex system leads to ...

  5. Evolution of the brain - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_the_brain

    The evolutionary history of the human brain shows primarily a gradually bigger brain relative to body size during the evolutionary path from early primates to hominins and finally to Homo sapiens. This trend that has led to the present day human brain size indicates that there has been a 2-3 factor increase in size over the past 3 million years ...

  6. Post-orbital constriction - Wikipedia

    en.wikipedia.org/wiki/Post-Orbital_Constriction

    For example, the average cranial capacity for Australopithecines is 440 cc, and the post-orbital constriction index is 0.66. [1] [5] However, with the evolutionary change in brain size in Australopithecines to the Homo genus, the average cranial capacity for Homo Habilis is 640 cc, and the post-orbital constriction index is 0.72.

  7. Expensive tissue hypothesis - Wikipedia

    en.wikipedia.org/wiki/Expensive_Tissue_Hypothesis

    The human brain stands out among the mammals because of its relative size compared to the rest of the body. The brain of Homo sapiens is about three times larger than that of its closest living relative, the chimpanzee. For a primate of its body size, the relative size of the brain and that of the digestive tract is rather unexpected; the ...

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  9. Brain–body mass ratio - Wikipedia

    en.wikipedia.org/wiki/Brain–body_mass_ratio

    Recent research indicates that, in non-human primates, whole brain size is a better measure of cognitive abilities than brain-to-body mass ratio. The total weight of the species is greater than the predicted sample only if the frontal lobe is adjusted for spatial relation. [ 19 ]