Objective, less tense, dealing with nerves (6)

I believe the answer is:
neural
'objective' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for neural that I've seen before include "Relating to nerves" , "Relating to the nervous system" , "To do with nerve of unreal kind" , "Nervy" , "Relating to a nerve" .)
