Interestingly, those born in this age of multimedia have an increasing capacity to switch between sights, sounds, smell and touch that are presented at a higher rate than those of us born in a slower world. Unfortunately, the amount of information held in active memory has not really changed (although there is evidence that certain video game players have grown in this area). Thus young people can sift through what seems to be a bombardment of information better than older people, but cannot process it to the same extent.
Feeling cognitive overload is one of the main sources of measurable stress, the kind that eats at our health. This happens when we try to hold too much in our active memory for too long. It's the reason why worry creates stress. We need to learn to process and release, which is why meditation and prayer are often so essential for healthier lives.