Janie, I've recently discovered the writing of Jonah Lehrer who seems very good at making neuroscience research easy for a non-neuro scientist to understand. http://scienceblogs.com/cortex/index.php?page=2

I'm only just discovering this research through Jonah Lehrer so I would say I am not really very up on it. But it does make a great deal of sense such as explaining why it take several weeks for SSRI's to work when they enter your bloodstream immediately after you take them and should work sooner....the brain begins to build new neurons. I think that the practice of cognitive-behavioral techniques builds new neurons as well, don't you think?