Study finds that gamers are more aggresive against strangers than friends
For 14 teams of three young men, salivary testosterone and cortisol were assessed twice before and twice after competing in within-group and between-group video games that simulated violent male–male competition. Men who contributed the most to their teams’ between-group victory showed testosterone increases immediately after the competition, but only if this competition was played before [...]
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Someone here hasn't read his studies. Give me a day to find my psychology textbook and google and I'll find ten studies to replace that.
But eh, studies. Like sand on the beach.