I have no idea why. It's been like this for years. It can affect me during twitch-based gaming (if I'm using the term correctly) like first person shooters or MMO PvP, but it also affects me during turn-based gaming like collectible/trading card games. Adrenaline makes sense during the former, because heightened awareness increases performance. The problem is that it also happens during the latter, but doesn't happen during games like Dark Souls. Does this happen to anyone else? Does anyone know what this is?