Nielsen looks at smartphone, tablet owners, and what they're doing with those devices while watching television.

The majority of Americans who watch television take to their smartphones, tablets, and e-readers to maximize their productivity and entertainment while a show is on, a new study has found.

According to Nielsen, 42 percent of Americans who own tablets are using that device each day when watching television. On the smartphone side, 40 percent of folks turn on their handsets each day when watching a show. Just 14 percent of e-reader owners, however, use that device every day when they’re watching a television show.

Given those figures, it might not be surprising to learn that just 12 percent of tablet owners and 13 percent of smartphone owners never use those devices when watching television. A whopping 45 percent of e-reader owners, however, never pick up that device when a show is on.MORE