sorry I can still not see the difference between a neuro and an ordinary psychiarist

the ordinary psychiatrist did all that.

and said of course I'm depressed, with that amount of pain any one would be.

so to go back to the original Q.

for what reason are they so special to have the word 'neuro' in front of their name. this is what I do not understand.

What does a neuro psychologist/psychiatrist do that that the run of the mill ones don't?