On Wed, 24 Jun 2009 03:17:47 -0400, "Praaveen" <praaveenk from gmail.com>
wrote:
>Dear Friends,
>>I am looking for a clear and precise answer for my question Why does one
>side of the brain control the opposite side of the body?
>>Please help me to find an answer this question.
>>Looking forward with interest to hear from you.
>
First, you should know that this crossover (decussation is the
technical term) is a peculiarity of vertebrates. Most animals don't
show it.
Here is a discussion on this subject I participated in five years ago
http://sci.tech-archive.net/pdf/Archive/sci.bio.evolution/2004-12/0204.pdf
That describes my hypothesis that it was just a glitch in the
left-right embryological determination system. There have been
adaptationist explanations and connectionist explanations but there is
still no really satisfactory and generally accepted view.
Here is a connectionist argument
http://sci.tech-archive.net/pdf/Archive/sci.bio.evolution/2004-12/0204.pdf
Here is an adaptationist explanation
http://www.ncbi.nlm.nih.gov/pubmed/12523550
