http://www.almotamar.net صحيفة إلكترونية يومية تصدر عن حزب المؤتمر الشعبي العام (اليمن) http://www.almotamar.net/2474.htm 2007-04-27 For many years, it was thought that all of our brain cells (neurons) are produced before birth, or exceptionally, up to one or two years after birth, but then the process supposedly stopped. From then on, most brain scientists believed, brain circuits could only be modified by altering the synapses, or contacts between existing cells. In this view, the total complement of cells, anatomically organized by function and forming major pathways, constituted the brain’s “hardware.” The detailed nature of the relation between cells, the modifiable synapses, was the software.