Building Attention Span
Over the past few years researchers have done a lot of work on attention span, and how the brain is being re-sculpted by all those hours a day spent online. One of the conclusions that some of them are coming to is that the online life nurtures fluid intelligence and offline life is better at nurturing crystallizing intelligence.
.. Crystallized intelligence is the ability to use experience, knowledge and the products of lifelong education that have been stored in long-term memory. It is the ability to make analogies and comparisons about things you have studied before. Crystallized intelligence accumulates over the years and leads ultimately to understanding and wisdom.