Spontaneous Headshake after a Kinematic Event (SHAAKE): Evaluating the Utility of a Potential New Sign in the Diagnosis of Concussion.

This study also revealed the subjectivity of many concussion signs, finding that inter-rater reliability for two major concussion signs, “loss of responsiveness” and “blank and vacant look”, was “fair” and did not reach statistical significance [ 27 ].

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