Furthermore, these player's cognitive and fMRI data were at least as impaired as 3 players who sustained a concussion during the season, although differrent areas of activation were noted via fMRI. All ImPACT scores were near ceiling during each assessment for all athletes. The 4 nonconcussed players with positive findings had a greater total number of collision events throughout the season than the concussed and nonconcussed (with no decline in cognitive performan) groups. Furthermore , while the total number of blows differentiated the groups , the median peak linear acceleration did not. The number of impacts experienced in the week immediately preceding in season reassessment was significantly correlated with changes in fMRI activation in all players. Interestingly, the group with no concussion and no changes on cognitive measures had more collisions per player in each location on the helmet than the concussed group, suggesting that concussion was due to a particularly damaging single or smaller number of blows rather than a lowered concussion Threshold from a cumulative.