It has to do with "collective memory" which means shared remembering by many people of what an event or thing was like.
I believe that the idea is that when journalists report news, HOW they tell the story influences how their readers understand it, and later how they remember it.
The journalist can never tell 100% of what happened, down to the smallest detail. So the decisions that the journalist makes about what is true and what is important will influence what people know and remember about the event.
In some cases the original study is very different from what i later revealed, but people may remember the original better, even though it is less accurate.
Maybe the following article is of interest to you:
Trümper, S., & Neverla, I. (2013). Sustainable Memory. How Journalism Keeps the Attention for Past Disasters Alive. Studies in Communication| Media, 2(1), 1-37. http://www.scm.nomos.de/fileadmin/scm/doc/SCM_13_01_00.pdf