EMBARGOED UNTIL MIDNIGHT EASTERN TIME SUNDAY, FEB. 17 - Joe Jensen, 2, watches television as a special treat in the afternoon, Tuesday, Feb. 12, 2013 at his home in Seattle. Joe's mother, Nancy Jensen, was a participant in a new University of Washington study on the effects of television viewing on kids that will be published Monday, Feb. 18, 2013. (AP Photo/Ted S. Warren)

EMBARGOED UNTIL MIDNIGHT EASTERN TIME SUNDAY, FEB. 17 - Nancy Jensen, right, watches as her children, Elizabeth, 6, left, and Joe, 2, center, play with a building set and other toys, Tuesday, Feb. 12, 2013 at their home in Seattle. Nancy was a participant in a new University of Washington study on the effects of television viewing on kids that will be published Monday, Feb. 18, 2013. As a result of what she learned, her children spend more time with hands-on toys and less time watching TV. (AP Photo/Ted S. Warren)

EMBARGOED UNTIL MIDNIGHT EASTERN TIME SUNDAY, FEB. 17 - Nancy Jensen, left, looks on as her son Joe, 2, is given a special treat of a little TV time Tuesday, Feb. 12, 2013 at their home in Seattle. Nancy was a participant in a new University of Washington study on the effects of television viewing on kids that will be published Monday, Feb. 18, 2013. (AP Photo/Ted S. Warren)

EMBARGOED UNTIL MIDNIGHT EASTERN TIME SUNDAY, FEB. 17 - Nancy Jensen, second from left, looks on as her son Joe, 2, is given a special treat of a little TV time Tuesday, Feb. 12, 2013 at their home in Seattle. Nancy was a participant in a new University of Washington study on the effects of television viewing on kids that will be published Monday, Feb. 18, 2013. (AP Photo/Ted S. Warren)

EMBARGOED UNTIL MIDNIGHT EASTERN TIME SUNDAY, FEB. 17 - Elizabeth Jensen, 6, center, and her brother Joe Jensen, 2, left, are given the special afternoon treat of a little TV time, Tuesday, Feb. 12, 2013 at their home in Seattle. The children's' mother Nancy Jensen was a participant in a new University of Washington study on the effects of television viewing on kids that will be published Monday, Feb. 18, 2013. As a result of what she learned, her children spend more time with hands-on toys and less time watching TV. (AP Photo/Ted S. Warren)

Nancy Jensen, left, looks on as her son Joe, 2, is given a special treat of a little TV time Tuesday, Feb. 12, 2013 at their home in Seattle. Nancy was a participant in a new University of Washington study on the effects of television viewing on kids that will be published Monday, Feb. 18, 2013. (AP Photo/Ted S. Warren)

Joe Jensen, 2, watches television as a special treat in the afternoon, Tuesday, Feb. 12, 2013 at his home in Seattle. Joe's mother, Nancy Jensen, was a participant in a new University of Washington study on the effects of television viewing on kids that will be published Monday, Feb. 18, 2013. (AP Photo/Ted S. Warren)

EMBARGOED UNTIL MIDNIGHT EASTERN TIME SUNDAY, FEB. 17 - Nancy Jensen, second from left, looks on as her son Joe, 2, is given a special treat of a little TV time Tuesday, Feb. 12, 2013 at their home in Seattle. Nancy was a participant in a new University of Washington study on the effects of television viewing on kids that will be published Monday, Feb. 18, 2013. (AP Photo/Ted S. Warren)

Elizabeth Jensen, 6, center, and her brother Joe Jensen, 2, left, are given the special afternoon treat of a little TV time, Tuesday, Feb. 12, 2013 at their home in Seattle. The children's' mother Nancy Jensen was a participant in a new University of Washington study on the effects of television viewing on kids that will be published Monday, Feb. 18, 2013. As a result of what she learned, her children spend more time with hands-on toys and less time watching TV. (AP Photo/Ted S. Warren)

Nancy Jensen, right, watches as her children, Elizabeth, 6, left, and Joe, 2, center, play with a building set and other toys, Tuesday, Feb. 12, 2013 at their home in Seattle. Nancy was a participant in a new University of Washington study on the effects of television viewing on kids that will be published Monday, Feb. 18, 2013. As a result of what she learned, her children spend more time with hands-on toys and less time watching TV. (AP Photo/Ted S. Warren)