How will video games affect your brain

It depends on what type of game
I will use the video game "Grand Theft Auto" as a reference

In Grand Theft Auto it is your job to cause murder and mayhem and you get rewards for that behavior, that teaches people that killing people, car jacking people, and robbery is ok and will get them rewards, but if they play the video game "The Sims" it doesn't teach them anything really, because in The Sims it is your job to take care of virtual and fictional people, so it all depends on the game that they play.