The document summarizes a psychological study that tested how the presence of a smartphone affects concentration. Researchers had participants complete a concentration test under different conditions: with the smartphone in view, locked away but in view, and taken out of the room. The results showed that concentration and performance on the test increased the further the smartphone was, up to a 26% improvement when the smartphone was removed. Women also reported higher anxiety during the test than men. In conclusion, separating from one's smartphone can improve concentration.