Liberty city in a fine city : an aggression and cultivation research study amongst youths in Singapore. by Chong, Gabriel Yew Mun., Teng, Scott Kie Zin., Siew, Amy Sok Cheng.

“…Participants played Grand Theft Auto IV for two hours per session, two sessions a week over a period of three weeks and were compared to a control group on trait aggression, attitudes toward violence, empathy, and first and second-order cultivation measures. …”
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