Adrenaline causes physiological changes including pupil dilation, increased tunnel vision, and sped-up processes that contribute to a higher frame rate perception.

“adrenaline and that and that tunnel vision and then the frames are fat are so if I inject you with just a little bit of adrenaline it it stays in your periphery but it activates systems in your brain in parallel to that and um you're going to experience an immediate dilation of your pupil your you'll have more tunnel vision I mean every process is sped up in the direction of higher frame rate”