A/S ratio
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The A/S ratio is the proportion of the brain not directly connected with either receptor inputs or motor outputs, where A is the association cortex and S is the sensory cortex. The A/S ratio can be measured for any organism with a brain, and the higher the A/S ratio, the more complex the brain is.
It was proposed by Donald Hebb in 1949.
References
[edit]Lerner, Dr. Richard M. (2002). Concepts and Theories of Human Development. Mahwah, N.J.: L. Erlbaum. ISBN 978-0-585-38736-9. OCLC 49569701.
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