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What he saw there was a culture of warfare that often perpetuated itself through misunderstanding and misinformation, with no mechanism for those of opposing sects or political forces to gain a sense of the enemy as a fellow human being.

“I began to think, ‘I’m meeting the same people over and over again,’” he said. “I’m seeing people I knew as kids, and now they’re grown-up fighters, in power, fighting the same fight. And you start to think about your work in terms of: ‘Am I helping to change anything? Am I having any impact?’ ”

“I thought of myself as a war illustrator. I started calling myself that.”

as a visiting artist at the university’s Center for Art, Science and Technology, he transformed what he initially conceived of as an unconventional photo and testimonial project involving fighters into a far more unconventional way of hearing and seeing his subjects, hoping to be able to engender a form of empathy beyond the reach of traditional documentary film

Then he and a small crew captured three-dimensional scans of the men and photographed them from multiple angles

He interviewed Mr. Khaled in Gaza and Mr. Peled in Tel Aviv, asking them the same six questions — basic ones like “Who’s your enemy and why?”; “What is peace for you?”; “Have you ever killed one of your enemies?”; “Where do you see yourself in 20 years?”

he began to build avatars of his interviewees and ways for them to move and respond inside a virtual world so realistic it makes even a 3-D movie seem like an artifact from the distant past. Mr. Harrell describes it as “long-form journalism in a totally new form.”

“You have something here you don’t have in any other form of journalism: body language.”

indeed, inside the world they have made, the power comes from the feeling of listening to the interviewees speak (you hear Mr. Ben Khelifa’s disembodied voice asking the questions, and the men’s voices answer, overlaid by the voice of an interpreter) as your body viscerally senses a person standing a few feet away from you, his eyes following yours as he talks, his chest rising and falling as he breathes.

Sofia Ayala, an M.I.T. sophomore, tested the project after I did and emerged — as I did — with a mesmerized flush on her face, a feeling of meeting someone not really there. “It makes it feel so much more personal than just reading about these things online,” she said. “When someone’s right there talking to you, you want to listen.”

“In many places I’ve been, you’re given your enemy when you’re born,” he said. “You grow up with this ‘other’ always out there. The best we can hope is that the ‘other’ will now be able to come into the same room with you for a while, where you can listen to him, and see him face to face.”

All were told that there would be a second phase to the experiment, also lasting five minutes, in which they could eat the chocolate they earned. But they were told they would forfeit any chocolate they couldn’t consume, and they were asked how much they expected to be able to eat.

On average, people in the high-earner group predicted that they could consume 3.75 chocolates. But when it came time to “earn” chocolates, they accumulated well beyond their estimate

“We introduce the concept of ‘mindless accumulation,’ ” said one of the paper’s authors, Christopher Hsee, a professor of behavioral science and marketing at the University of Chicago Booth School of Busi

The impulse seemed less pronounced, even mixed, with the low earners. They earned less chocolate than they predicted they could eat. But the high earners and the low earners listened to about the same amount of obnoxious noise in the five-minute period, which Dr. Hsee said strongly suggested that both groups were driven by the same thing: not by how much they need, but by how much work they could withstand.