Microsoft gathered evidence to demonstrate how the omnipresence of technologies reduces human ability to concentrate on any single subject for a longer period of time. The study, which included EEG brain tests using appropriate questionnaires, concluded that the ability to focus and concentrate showed a rapid decline compared with data from the beginning of this century. Back in 2000, we managed to concentrate on one task for as long as 12 seconds. In 2013 it was only 8 seconds. That could be a consequence of the existence of smartphones and an excessive amount of contents in them, which are being thrown at us when combined with computers. Many people, especially young ones, are nowadays almost addicted to smartphones and social networks with new 'ingredients' reaching them all the time.
The reality is, thankfully, not as bleak as the study would suggest. While we may have become less able to concentrate on one task for long, human ability to multi-task has quite improved, allowing us to focus better on something for just a short period of time.