Audrey "Stimuli" Sparks can sense and control neural impulses, the electrical discharges that travel along the nerve fibers within organisms. She can partially influence thoughts or kill by blocking the heart's contraction or by either depriving or overloading the target with neural impulses. Memories can notably be rewritten by preventing her targets from accessing parts of their brain. Stimuli can also establish a link between organisms to mentally pick up and transmit neural impulses as if they were their own to begin with. This can be used in many creative ways as well, like making her target "hear" things to disorient them in crucial moments.

Stimuli also has the power to energize minds to achieve a higher level of focus, reflex, and sense for combat, and can also increase the surge of neural impulses that are released to perform actions faster. In the midst of battle, she can suppress pain and cripple targets when there's an opening. When the battle is over, her power can even be used to prevent someone from accessing their own abilities, particularly if it is consciously controlled. Stimuli can create neural impulses to stimulate targets sensitivity to pain and even mimic electric shocks. 

Her secondary mutation allows her entire to absorb and store electricity for a time before needing to channel or discharge it, typically doing so through the use of her primary mutation. Her greatest feat to date being taking a direct lightning strike and holding that electricity for a whole day before using it to stop multiple attackers from capturing her.