Related Experiment Video
Updated: Aug 14, 2026
A Neuroscientific Approach to the Examination of Concussions in Student-Athletes
Published on: December 8, 2014
No cumulative effects for one or two previous concussions
G L Iverson1, B L Brooks, M R Lovell
1Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada. giverson@interchange.ubc.ca
Background:
Sports medicine clinicians and the general public are interested in the possible cumulative effects of concussion.
Objective:
To examine whether athletes with a history of one or two previous concussions differed in their preseason neuropsychological test performances or symptom reporting.
Method:
Participants were 867 male high school and university amateur athletes who completed preseason testing with ImPACT version 2.0. They were sorted into three groups on the basis of number of previous concussions. There were 664 athletes with no previous concussions, 149 with one previous concussion, and 54 with two previous concussions. Multivariate analysis of variance was conducted using the verbal memory, visual memory, reaction time, processing speed, and postconcussion symptom composite scores as dependent variables and group membership as the independent variable.
Results:
There was no significant multivariate effect, nor were there any significant main effects for individual scores. There was no measurable effect of one or two previous concussions on athletes' preseason neuropsychological test performance or symptom reporting.
Conclusion:
If there is a cumulative effect of one or two previous concussions, it is very small and undetectable using this methodology.
