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Evolution of the Brain: Revision history

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  • curprev 17:4117:41, 26 January 2025 Rob talk contribs 4,089 bytes +727 No edit summary
  • curprev 17:2817:28, 26 January 2025 Rob talk contribs 3,362 bytes +3,362 Created page with "== 600m ya - Bilaterians and Steering == === Valence === * Bilaterians are the only animals that have brains * Nematodes (legless wormlike creatures about the size of a grain of rice) emerge in the Edicaran period from 635 to 539m ya. * Brain had 302 neurons (against 85 billion today * Initial steering is obtained through assessing the valence (goodness or badness) of a stimulus, and going towards the things that smelled good and away from the things that smelled bad...."