Students wore the Focus headset and teachers could monitor their average attention levels using an app BrainCo

Are you concentrating? Some teachers are checking whether their students are paying attention by using headbands that read brain signals.

Focus headbands, made by BrainCo in Massachusetts, were used in a recent trial with 10,000 schoolchildren aged between 10 and 17 in China. Over 21 days, students wore the headsets during class and teachers could monitor their average attention levels using an app.

Lights on the front of the headsets also show different colours for distinct attention levels – flagging …