He suggests the theory was developed to explain how “brain changes occur in depression in a more accessible way”. Again, it’s not clear what he means by this. But this seems to be the crux of the problem. Are the brain changes in depression any different from ‘normal’? Depression is a personal condition. Of course it’s mediated by the brain. That’s commonsense and not rocket science. People don’t need a chemical imbalance theory to understand that.
Young's convinced that “brain changes do occur in the brain of depressed people”. He seems to be saying that these changes cause depression. He’s got muddled that people are their brains (eg. see previous post). Of course I have a brain. If I was depressed I would still have a brain. But that brain is not me, whether I’m depressed or not. It doesn’t cause my depression.