16 January 2010

3.5 thousand million years of evolution from the origins of life on earth to human brains. The relative size of the forebrain has increased most during evolution - fishes have a very small one. The prefrontal cortex tripled in size in just two million years. Brains are so remarkably conservative in that simple animals such as sea slugs provide ideal models for understanding human neurological function. The sea slug, with 20 000 neurons, served as a model for how memory works.

No comments: