nostr:npub1u2vwrtzycscs56pxwmq7llk0p6s07egpxg58cvc7qgu3vr0vhszsf54999 
The emerging story for nearly all brain disorders is that the same symptoms follow from a plethora of causes and different individuals with the ‘same’ disorder will require different treatments (precision medicine). I believe that the degeneracy you are talking about here is closely related. 

Cystic fibrosis (while not a brain disorder) is one example - it’s always a mutation to one gene, but the drug needed to treat it depends on what the mutation is. Now take that complexity and multiply it for the more typical disorders that aren’t associated with a single gene (but many genes + environmental interactions).

So yes on appreciating the degeneracy and understanding those  many biophysical stuffs to one function principles!