bb2011 ANP220 09 How can we afford such big brains

bb2011 ANP220 09 How can we afford such big brains - Brain...

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1 How can we afford such big brains? ANP 220 meeting #09 Brain evolution ultimate causes “prime movers” adaptive value of large brain selective forces & possible benefits proximate causes “prime releasers” underlying mechanism allowing to have large brain physiology/ morphology Prime movers hunting complex foraging social intelligence (group size) etc. highly speculative NO CAUSE-EFFECT SHOWN, “JUST” CORRELATIONS! Brain evolution ultimate causes “prime movers” adaptive value of large brain selective forces & possible benefits proximate causes “prime releasers” underlying mechanism allowing to have large brain physiology/ morphology
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2 Goals for (last Monday and) today brain evolution in hominins early ideas about brain expansion first big brains, then modern body? why larger brains? paper by Kenneth Oakley what selects for big brains? how can we afford such big brains? papers by Dean Falk and Ann Gibbons brain radiator, expensive tissue, human gut, cooking & further consequences Prime releasers 1. morphology brain radiator hypothesis 2. energy expensive tissue hypothesis [maternal investment hypothesis] cooking as an adaptation Prime releasers Brain radiator hypothesis Brain radiator brain heat sensitive 4-5 degrees C increase disturbs brain function modern humans no carotid rete
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3 Brain radiator brain heat sensitive 4-5 degrees C increase disturbs brain function modern humans no carotid rete very large brain especially heat-sensitive selective cooling emissary veins (valve-less)
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bb2011 ANP220 09 How can we afford such big brains - Brain...

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