Originally Posted by
rudestuff
In my outfit the PIC in the left seat has his hand on the thrust levers and makes the decision. If he's being trained in that seat he would still be expected to make the call and do the actions, except that the RHS trainer could also override his decision. Telling him/her that it's NOT his decision would be gross negative training.
If you think about it, it's actually both pilots decision to go flying: I would expect an FO to reject before V1 if a reject scenario presents itself and the captain does nothing.
Correct up to the point where (second scenario) the FO can exercise emergency authority upon suspicion that the Captain suffers from incapacitation and hence rejects the takeoff.
So master warning on the takeoff run well below V1, Capt says nothing and does nothing, an impairment can be suspected by the FO and decides what to do. Hence the importance from the Captain of clearly stating aloud "STOP OR GO" (Or whatever You use in your airlines) at least to make sure that the folk is still with us.