If Snyder and Mitchell are correct, we all have tremendous potential. The prospects are exciting, but any application will be delayed until we know whether there are any long-term effects. During the second world war, millions of amphetamines were issued to air crew and other personnel who needed to stay alert for long periods. Only later was it discovered that the drug could produce psychosis. However, millions of people are already engaged in an experiment of this kind.
Mobile phones expose the brain to electromagnetic radiation.
The field is much weaker than that used in TMS, but it has a detectable effect on the brain. Dr Alan Preece of the Bristol Royal Infirmary carried out tests which showed that a simulated mobile phone field could improve reaction time. The mechanism involved is not yet clear. The effects of a mobile phone call persist after the exposure ends. Swiss researchers found that brain activity was altered for up to three-quarters of an hour after calling.