Out of 27 universities included in one the nation's largest surveys on campus sexual assault , a majority of students at just four schools said they intervened when they saw someone "acting in a sexually violent or harassing manner."

At 23 of the schools, most students said they didn't do anything when they saw situations that were possibly leading to sexual violence. The numbers should serve as a "call to action" on many campuses, said Jane Stapleton, co-director of the Prevention Innovations Research Center at the University of New Hampshire.

"We need to move our institutions forward to work creatively with students to figure out how to intervene as bystanders," Stapleton told The Huffington Post. "[Bystanders] are not these super-human individuals, we are all bystanders in many ways."

The Association of American Universities, a trade group that represents many top schools in the nation, surveyed 150,000 students at 27 different schools. Their findings, released Monday , showed 54.5 percent of students did nothing when they saw someone "acting in a sexually violent or harassing manner." Only Dartmouth College, the University of Missouri, Case Western Reserve University and the California Institute of Technology had a majority of students who said they did act in these situations.

In the survey, 77 percent of students overall said they did not act when witnessing "a drunk person heading for a sexual encounter."