AdvertisementConcussion Worries Renew Focus On Football SafetySeptember 24, 2010Tom GoldmanfacebookEmailThis is the screen on the sideline unit's laptop that researchers use to monitor head impacts on players. For each player, there's the depiction of a head -- arrows superimposed on the head represent impact; the length of the arrow corresponds to the magnitude of the impact. Researchers can look at the screen, the little red head, see the direction of the arrow and how long it is, and determine where the blow came from and how large it was.