Evolution: Brain edition

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9 Terms

1
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Basic nervous system similarities across vertabrea

  1. development forms a hollow neural dorsal tube (AKA forms a spine)

  2. bilateral symmetry

  3. segmentation

  4. hieracheal control

  5. seperate systems

  6. localization of functions


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Encephalization quiotient (EQ)

looks at each class’s deviation from the slope of the brain:body weight ratio

  • Cortex size increases with brain size


<p>looks at each class’s deviation from the slope of the brain:body weight ratio</p><ul><li><p>Cortex size increases with brain size</p></li></ul><p></p>
3
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Austrolopithecus

  • 4 million years ago

  • bipedal

  • glorified monkey


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Homospecies

  • homo habilis

  • homo erectus

  • homo sapiens


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Homo Habilis

it really didn’t do much.

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Homo erectus

Expanded over 1.5 million years, made elaborate stone tools, and killed large animals

  • Us but generally overall much worse


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Homo sapien

emerged ~150,000 years afo

  • us


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Social brain hypothosis

idea that our brain is so large because a bigger cortex is better for handling complex social relationships

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sexual brain hypothosis

idea there is a nautural seletion for abilities to attract a mate; the more brain we have, the more we can do, the better we are