Cross-posted at The Huffington Post.In most densely-packed urban cities, one will be able to observe a disturbing phenomenon: wealthy people marching past the homeless, day in and day out.  Often, the residents of the street and the residents of the apartments recognize each other and even know each other’s routines.  And, yet, familiarity doesn’t breed concern.

Psychologists Lasana Harris and Susan Fiske were able to detect a neurological process behind the ability to get used to seeing others suffer. Using functional MRIs, they exposed individuals to images of the homeless.  These images tended to activate parts of the brain associated with disgust.  This, they argue, supports the idea that “extreme out-groups may be perceived as less than human…”  It is easy to overlook the suffering of the homeless, then, because we dehumanize them.

In an effort to disrupt this cognitive process, documentary film maker Goro Toshima has released a new film, Broken Doors.  The 36-minute documentary follows a young homeless couple in Los Angeles, Starr and Rico.  Not only does it put faces and names to an otherwise reviled and ignored population, the documentary shows viewers just how difficult it can be to survive on the streets and to get off.

Lisa Wade, PhD is an Associate Professor at Tulane University. She is the author of American Hookup, a book about college sexual culture; a textbook about gender; and a forthcoming introductory text: Terrible Magnificent Sociology. You can follow her on Twitter and Instagram.