A new study from KPMG suggests that the majority of Americans now watch TV… (Joe Klamar / AFP/Getty Images )

For millions of U.S. consumers, one screen in the living room is not enough.

A new study from KPMG finds that 60% of American television viewers are devoted multitaskers, watching TV and accessing the Internet at the same time.

"We continue to see that multitasking is getting bigger and bigger," said Paul Wissmann, leader of KPMG's U.S. Media & Telecommunications practice. "It's getting to older generations as well, as there are more and more options in front of them."

IN CASE YOU MISSED IT SAG 2013: Winners |Quotes | Photo Booth | Backstage | Best & Worst

That has implications for network programmers and advertisers, which can no longer be sure which screen is drawing the viewer's eyes, Wissmann said.