On the other hand, the results are quite heterogenous and controversial, as they have not singularly shown that some of the most relevant neuronal damage biomarkers—glial fibrillary acidic protein (GFAP) or neurofilament light (NFL)—levels changes might not be associated with prolonged symptoms or cognitive impairments due to concussive events [53,54,55]. This evidence concerns the gene NEFL and Cognitive impairment.