Aggression
Some scholars believe that behaviors like aggression may be partially learned by watching and imitating people's behavior, while other researchers have concluded that the media may have some small effects on aggression. There is also research questioning this view. For instance, a long-term outcome study of youth found no long-term relationship between playing violent video games and youth violence or bullying. One study suggested there is a smaller effect of violent video games on aggression than has been found with television violence on aggression. This effect is positively associated with type of game violence and negatively associated to time spent playing the games. The author concluded that insufficient evidence exists to link video game violence with aggression. However, another study suggested links to aggressive behavior.
Corporal punishment in the home
In examining several longitudinal studies that investigated the path from spanking to aggression in children from preschool age through adolescence, Gershoff concluded: "In none of these longitudinal studies did spanking predict reductions in children’s aggression [...] Spanking consistently predicted increases in children’s aggression over time, regardless of how aggressive children were when the spanking occurred". A 2010 study at Tulane University found a 50% greater risk of aggressive behavior two years later in young children who were spanked more than twice in the month before the study began. The study controlled for a wide variety of confounding variables, including initial levels of aggression in the children. According to the study's leader, Catherine Taylor, this suggests that "it's not just that children who are more aggressive are more likely to be spanked."