Over the last 50 years, we've had to cope with an explosion of media, technologies, and interfaces, from the TV clicker to the World Wide Web. And every new form of visual media - interactive visual media in particular - poses an implicit challenge to our brains: We have to work through the logic of the new interface, follow clues, sense relationships. Perhaps unsurprisingly, these are the very skills that the Ravens tests measure - you survey a field of visual icons and look for unusual patterns.
The best example of brain-boosting media may be videogames. Mastering visual puzzles is the whole point of the exercise - whether it's the spatial geometry of Tetris, the engineering riddles of Myst, or the urban mapping of Grand Theft Auto.
The message there is that things derided as stultifying, such as TV programmes and computer games, actually make you smarter; in contrast, locking yourself in a room and reading the classics instead, as wise authorities would recommend, will cause these cognitive skills to atrophy.
Of course, human neural capacity hasn't been increasing steadily over the past century; our brains are roughly the same same size as those of our great grandparents were, and made of the same kinds of neurons and synapses. As such, it'd be a matter of give and take. As some skills increase, pushed on by new technologies, others atrophy, and conservatives decry the mind-rotting effect of new technologies. This is not a new phenomenon; when writing was invented, there surely were grumpy pundits decrying the inevitable decline of epic-poem memorisation skills (and I doubt whether anyone today, with the possible exception of certain autistic savants, would not appear hopelessly stupid to the ancients by such criteria were they sent back in time); ditto the decline of mental arithmetic skills with the advent of calculators. (Some among you will remember debates on whether giving schoolchildren calculators will harm their mathematical skills.) And, of course, agriculture and the city lifestyle has just about killed wilderness survival skills for any but professional experts trained in these.
Anyway, back to the point in question. One thing I would expect to emerge is improved skills at dealing with an information-rich environment, such as abstract problem-solving and multitasking skills. The other side of the coin would be shortened attention spans; as compulsive multitaskers constantly bombarded with multiple flows of information, we don't need the ability to patiently focus on one thing as our ancestors did, and so it has atrophied. (I once read that one of the reasons that Hollywood remakes so many old films, other than marketing with new casts/soundtracks/gimmicks, is that a lot of people these days find the original films too slow-paced and boring.)
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