“Headphones are the new wall,” he said, pointing to the covered ears of his neighbors.

Cubicle culture is already something of a punch line — how many ways can we find to annoy one another all day? — but lately the complaints are being heard by the right people, including managers and social scientists. Companies are redesigning offices, piping in special background noise to improve the acoustics and bringing in engineers to solve volume issues. “Sound masking” has become a buzz phrase.

Scientists, for their part, are measuring the unhappiness and the lower productivity of distracted workers. After surveying 65,000 people over the past decade in North America, Europe, Africa and Australia, researchers at the University of California, Berkeley, report that more than half of office workers are dissatisfied with the level of “speech privacy,” making it the leading complaint in offices everywhere.

“In general, people do not like the acoustics in open offices,” said John Goins, the leader of the survey conducted by Berkeley’s Center for the Built Environment. “The noisemakers aren’t so bothered by the lack of privacy, but most people are not happy, and designers are finally starting to pay attention to the problem.”

When Autodesk, a software company, moved into a an open-plan building in Waltham, Mass., three years ago, it installed what is known as a pink-noise system: a soft whooshing emitted over loudspeakers that sounds like a ventilation system but is specially formulated to match the frequencies of human voices.

Autodesk ran the system for three months without telling the employees — and then, to gauge its impact, turned it off one day.

“We were surprised at how many complaints we got,” said Charles Rechtsteiner, Autodesk’s facilities manager. “People weren’t sure what was different, but they knew something was wrong. They were being distracted by conversations 60 feet away. When the system’s on, speech becomes unintelligible at a distance of about 20 feet.”

The original rationale for the open-plan office, aside from saving space and money, was to foster communication among workers, the better to coax them to collaborate and innovate. But it turned out that too much communication sometimes had the opposite effect: a loss of privacy, plus the urgent desire to throttle one’s neighbor.

“Many studies show that people have shorter and more superficial conversations in open offices because they’re self-conscious about being overheard,” said Anne-Laure Fayard, a professor of management at the Polytechnic Institute of New York University who hasstudied open offices. “Everyone is still experimenting with ways to balance the need for collaboration and the need for privacy.”

Take Mr. Udeshi’s office, at the N.Y.U.-Poly business incubator, a SoHo loft with dozens of start-up companies housed in low cubicles. The entrepreneurs there say they sometimes get useful ideas from overheard conversations but also find themselves retreating to a bathroom or a broom closet for private chats. When they have to discuss a delicate matter with someone sitting next to them, they often use e-mail or instant messaging.

“You talk to more people in an open office, but I think you have fewer meaningful conversations,” said Jonathan McClelland, an energy consultant working in the loft. “You end up getting interrupted a lot by people’s random thoughts.”

Despite complaints like this around the world, the open-plan design remains the norm, partly because it is cheaper and partly because many managers believe the plusses outweigh the minuses. It is especially popular in workplaces that require continual informal collaboration, like newsrooms, trading floors and political campaign offices.

At least one famous advocate of the open-plan office, Mayor Michael R. Bloomberg of New York, is not backing down, and it seems that the wall-free “bullpen” he set up in City Hall has won favor with many who use it.

“The bullpen really allowed free-flowing communication and efficiency,” said Edward Skyler, a former deputy mayor who sat several feet from Mr. Bloomberg. “It eliminated gatekeepers. You didn’t have to make an appointment to see someone.”