Psychologists are finding out that even when people try to focus on a task they tend to lose concentration within 40 minutes, and sometimes as little as 10 minutes. The studies are based on a new technique, called transcranial Doppler sonography, that uses ultrasound to monitor blood flow velocity in the brain. The technique could be turned into a warning system for workers who perform critical tasks -- such as pilots or air traffic controllers -- or even for drivers.

Distractions can break anyone's concentration, but new research shows what happens in your brain can, too.

The phenomenon is such that the more you look, the less you see

transcranial Doppler sonography (TDS). The device measures blood flow velocity in the brain

researchers saw a decrease in blood-flow velocity over time, and, therefore, a decrease in attention

Warm believes the study results can be helpful for the military, security workers, air traffic controllers and many others