Putting information together
You are standing on a station platform when a train speeds past - you see it, hear it, and feel the wind rushing past. You know instantly that everything you are sensing is to do with the train. Part of the parietal cortex of your brain allows you to focus your attention on one place, and puts together the relevant information from all your senses. Sometimes the information competes for your attention. Try doing the 'Stroop test' and you'll see how easily your brain can be distracted.