A recent study at Monash University, Melbourne, Australia, looked at the effects of texting on 11 -14 year olds.

"The kids who used their phones a lot were faster on some of the tests, but were less accurate. We suspect that using mobile phones a lot, particularly tools like predictive texts for SMS, is training them to be fast but inaccurate. Their brains are still developing so if there are effects then potentially it could have effects down the line, especially given that the exposure is now almost universal. The use of mobile phones is changing the way children learn and pushing them to become more impulsive in the way they behave."

So if these kids moved to voice texting rather than using predictive texting would this make them less impulsive?  They certainly would be more articulate.