If a hyperpolarizing graded potential and a depolarizing graded potential of similar magnitudes arrive at the trigger zone at the same time, what is most likely to occur? if a hyperpolarizing graded potential and a depolarizing graded potential of similar magnitudes arrive at the trigger zone at the same time, what is most likely to occur? nothing. they will cancel each other out. an action potential is fired off more quickly than usual. the cell becomes hyperpolarized. the cell becomes easier to excite. the cell dies.