SANTA BARBARA, Calif. — Should students about to read “The Great Gatsby” be forewarned about “a variety of scenes that reference gory, abusive and misogynistic violence,” as one Rutgers student proposed? Would any book that addresses racism — like “The Adventures of Huckleberry Finn” or “Things Fall Apart” — have to be preceded by a note of caution? Do sexual images from Greek mythology need to come with a viewer-beware label?

Colleges across the country this spring have been wrestling with student requests for what are known as “trigger warnings,” explicit alerts that the material they are about to read or see in a classroom might upset them or, as some students assert, cause symptoms of post-traumatic stress disorder in victims of rape or in war veterans.

The warnings, which have their ideological roots in feminist thought, have gained the most traction at the University of California, Santa Barbara, where the student government formally called for them. But there have been similar requests from students at Oberlin College, Rutgers University, the University of Michigan, George Washington University and other schools.

The debate has left many academics fuming, saying that professors should be trusted to use common sense and that being provocative is part of their mandate. Trigger warnings, they say, suggest a certain fragility of mind that higher learning is meant to challenge, not embrace. The warnings have been widely debated in intellectual circles and largely criticized in opinion magazines, newspaper editorials and academic email lists.