Outgroup homogeneity and terorism coverage in media

http://www.wbur.org/npr/532963059/when-is-it-terrorism-how-the-media-covers-attacks-by-muslim-perpetrators

"New research from Erin Kearns and colleagues at Georgia State University shows that the president is right — sort of. There is a systematic bias in the way terrorism is covered — just not in the way the president thinks.
Kearns says the "terrorism" label is often only applied to cases where the perpetrator is Muslim. And, those cases also receive significantly more news coverage.
"When the perpetrator is Muslim, you can expect that attack to receive about four and a half times more media coverage than if the perpetrator was not Muslim," Kearns says. Put another way, "a perpetrator who is not Muslim would have to kill on average about seven more people to receive the same amount of coverage as a perpetrator who's Muslim."
Perhaps these findings are not all that surprising to you. But there are disturbing implications for the way Americans perceive Muslims, and the way Muslims perceive themselves."