If you are sending a text, watching the TV or listening to the radio, you may want to stop and give this your full attention. Multi-tasking shrinks   the brain, research suggests. A study found that men and women who frequently used several types of technology at the same time had less grey matter in a key part of the brain. University of Sussex researchers said, "Simultaneously using mobile phones, laptops and other media devices could be changing the structure of our brains." The finding follows research which has linked multi-tasking with a shortened attention span, depression, anxiety and lower grades at school. The researchers began by asking 75 healthy men and women how often they divided their attention between different types of technology. This could mean sending a text message while listening to music and checking email, or speaking on the phone while watching TV and surfing the web. The volunteers were then given brain scans which showed they had less grey matter in a region called the anterior cingulate cortex (ACC). The findings held even when differences in personality were taken into account. The study, published in the journal PLOS ONE, is the first to make a link between multi-tasking and the structure of the brain. Researcher Kep Kee Loh said, "Media multi-tasking is becoming more common in our lives today and there is increasing concern about its impacts on our cognition and social-emotional well-being." He added that more research is needed to prove that multi-tasking shrinks the brain. This is because it is also possible that people with less grey matter in the ACC are more drawn to using lots of small devices simultaneously. Scientists have previously demonstrated brain structure can be changed on prolonged exposure to new environments and experience. Other studies have shown that training -- such as learning to juggle or taxi drivers learning the map of London -- can increase grey-matter densities   in certain parts. Experts have also warned of the harmful impact technology can have on our memory and attention span. The purpose of the passage is to   _  .
compare the latest research with previous ones prove the dangers of multi-tasking inform readers of research on multi-tasking discuss the benefits and problems of multi-tasking