The time period spent on watching these violent programs on the television is directly influential on whether or not violence in the media causes certain behavioural changes in the viewer. "Viewing violent programs raises rates of aggression among children who are heavy viewers." (DeFleur 1998:455) In a study conducted, such a result was concluded. This study was set up in order to discover what the effects of watching Saturday morning cartoons on a group of five-year-old would be. The children were placed in a laboratory and exposed to 30 minutes of cartoons. After the period of cartoon-viewing, the five-year-olds were sent out to play for an hour while researchers counted the number of aggressive acts performed against each other in this time frame. "As a control measure, you might take a similar group of children but let them watch Sesame Street or some other non-violent program, or not expose them to TV at all." (Fedler 1978:55) Comparison between the amount of aggressive acts performed by this group of children and that of the group which was exposed to the cartoons was then taken as a method to decipher the effects of exposure to TV violence. "Most of them do demonstrate a higher level of aggressive behaviour immediately after exposure. There is certainly evidence that children use TV as a model for play activities. But after a short time, something like 30 minutes, or if some activity like a break for milk and cookies intervenes, then the measurable effect is lost. Television defenders could argue a lack of any long-term effects of exposure to violence, and it is reasonable that viewing a single program is unlikely to have any significant permanent impact on a child. On the other hand, in real life, a child does not watch one or two programs. He or she sits in front of the set hour after hour, year by year. The cumulative effect of such exposure cannot be reproduced in a short laboratory experiment.&quo...