BRAIN FACTS AND FIGURES:

 

http://faculty.washington.edu/chudler/facts.html

 

Total neurons in the brain: 100 billion

 

Total neocortical neurons: Approximately 20 billion (Pakkenberg, B., Pelvig, D., Marner,L., Bundgaard, M.J., Gundersen, H.J.G., Nyengaard, J.R. and Regeur, L. Aging and the human neocortex. Exp. Gerontology, 38:95-99, 2003 and Pakkenberg, B. and Gundersen, H.J.G. Neocortical neuron number in humans: effect of sex and age. J. Comp. Neurology, 384:312-320, 1997.) And another paper: http://dx.doi.org/10.1002/(SICI)1096-9861(19970728)384:2%3C312::AID-CNE10%3E3.0.CO;2-K#search=%22humans%20million%20neocortical%20columns%22

 

Some claims:

 

A human neocortical column consists of 60,000 neurons

 

http://www.forbes.com/technology/sciences/2005/06/06/cx_mh_0606ibm.html

 

(Same article claims there are 10 billion neurons in the human brain)

 

Humans have a million (or millions) of neocortical columns

 

http://bluebrainproject.epfl.ch/FAQs.htm

 

So what is it?

 

20 billion neocortical neurons / 60,000 neurons per NCC = 333,333 NCCs

20 billion neocortical neurons / 1 million NCCs = 20,000 neurons per NCC

ya... it works in their way without our involvement.. Human body is the biggest laboratory in whole world and works fine even when we are sleeping...