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Evolutionary Origins of Our Brain June 28, 2009

Posted by rationalskeptic in Neuroscience.
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  • The authors have proposed that the specialization of the brain’s two hemispheres was already in place when vertebrates arose 500 million years ago.
  • The left hemisphere originally seems to have focused in general on controlling well-established patterns of behavior; the right specialized in detecting and responding to unexpected stimuli.
  • Both speech and right-handedness may have evolved from a specialization for the control of routine behavior.
  • Face recognition and the processing of spatial relations may trace their heritage to a need to sense predators quickly.


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