Recent quotes:

Cumulative Head Impact Exposure Predicts Later-Life Depression, Apathy, Executive Dysfunction, and Cognitive Impairment in Former High School and College Football Players

The investigation of RHI has most commonly been in contact sports, such as American football. More than 4,500,000 amateur athletes participate in tackle football each year,12,13 and this sport has one of the highest rates of concussion.14,15 Surveys of high school and college athletes show that ∼50% of football players sustain a concussion each year, and >30% sustain multiple concussions.14,16,17 Subconcussive events are likely even more frequent, as helmet-based accelerometer studies estimate that amateur football players average 600 subconcussive impacts per season in high school and >1000 at the collegiate level.3 The high prevalence of concussive and subconcussive events in amateur football players is concerning, given their reported association with acute18–20 and chronic21–25 neurological consequences. Repetitive subconcussive blows (measured by helmet accelerometer sensors recording events that exceed 14.4g10) are associated with pre- to post-season cognitive decline,10,26 functional brain alterations (e.g., reduced neurophysiological health),10,26,27 and microstructural white matter brain changes28 in high school football players.

Brain connectivity disruptions may explain cognitive deficits in people with brain injury | EurekAlert! Science News

A study recently published in the Journal of International Neuropsychological Society found that individuals who are at least six months post-injury exhibit between-network, long-range and inter-hemispheric connectivity disruptions. Specifically, scientists observed TBI-related connectivity disruptions in the default mode and dorsal attention networks and the default mode and frontoparietal control networks; interactions among the networks are key to achieving daily life goals.