He's been in their lives for over 10 years. But it goes on, and it will evolve.â. Indeed, Grey's has persevered after the departures of several regular cast members, including Isaiah Washington, Sandra Oh, Katherine Heigl, T.R. Knight, Kate Walsh, Eric Dane, Chyler Leigh, and Kim Raver.
1 Some state that the average human attention span is approximately 5 minutes; others state that most healthy teenagers and adults are unable to sustain attention on one thing for more than about 20 minutes at a time, although they can choose repeatedly to re-focus on the same thing.
The parents responded with a rating of 1 ânot at all like my childâ up to 5 âa lot like my childâ. An estimate of the childâs attention span on a scale of 1 to 5 was then generated from the average of the answers. Researchers then followed up when the children had become young adults.