TY  - JOUR
PY  - 1975//
TI  - Cumulative effect of concussion
JO  - Lancet
A1  - Gronwall, D.
A1  - Wrightson, P.
SP  - 995
EP  - 997
VL  - 306
IS  - 7943
N2  - Twenty young adults were studied after a second concussion. The rate at which they were able to process information was reduced more than in controls who had been concussed only once, and they took longer to recover than the controls. The effects of concussion seem to be cumulative, and this has important implications for sports where concussion injury is common.<p /> 
LA  - 
SN  - 0140-6736
UR  - http://dx.doi.org/10.1016/S0140-6736(75)90288-3
ID  - ref1
ER  -