Excerpt:
Dr. Gupta:
Dr. Craddock is looking at the brains of depressed people and of non-depressed people and comparing them. And he is seeing a difference.
Dr. Craddock:
I’m testing a hypothesis about depression that’s related to a network, a brain network that we all have. That network has been called the default network. The default network is more active when somebody is not performing a task than when they are performing a task.
Dr. Gupta:
In other words, the default network is the brain on idle. It’s on when we’re not asking our brains to concentrate on anything in particular. It turns off when we need to solve a problem or do any mental activity. Dr. Craddock’s theory is that depressed people have trouble turning that network off, maybe because their brains won’t let go of something that’s bothering them.
Dr. Craddock:
The thing with depression is these are people that just can’t stop thinking about it. They have a lot of trouble turning that off.
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