Because of the difficulty of proving the effects of individual media texts on their audience a theory. According to this, while any one media text does not have too much effect, years and years of watching more violence will make you less sensitive to violence, years and years of watching women being mistreated in soaps will make you less bothered about it in real life.
One difficulty with both of these ways of looking at the media is that they are very difficult to prove either way. Many people have a general sense that the media do affect our behaviour and advertisers certainly justify their fees by working on this assumption, but it can be extraordinarily difficult to actually prove how much effect if any a text might have on an audience. In fact researchers have spent enormous amounts of time and effort trying to prove the validity of the culmination theory with no success- this of course does not mean that there is no truth in it as an idea.
http://www.northallertoncoll.org.uk/media/audience.htm
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