Fossil evidence on origin of the mammalian brain.

  title={Fossil evidence on origin of the mammalian brain.},
  author={Timothy B. Rowe and Thomas E Macrini and Zhe-Xi Luo},
  volume={332 6032},
Many hypotheses have been postulated regarding the early evolution of the mammalian brain. Here, x-ray tomography of the Early Jurassic mammaliaforms Morganucodon and Hadrocodium sheds light on this history. We found that relative brain size expanded to mammalian levels, with enlarged olfactory bulbs, neocortex, olfactory (pyriform) cortex, and cerebellum, in two evolutionary pulses. The initial pulse was probably driven by increased resolution in olfaction and improvements in tactile… CONTINUE READING
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