In this study, we utilized graph-theory to investigate functional brain topological alternations in cognitively impaired active professional fighters, as compared to cognitive non-impaired fighters. We observed reduced global and local efficiency across multiple sparsity levels, suggesting that both functional integration and segregation were affected in cognitively impaired fighters. A different functional topological organization was further observed in impaired fighters, shown by increased number of rich clubs and reduced rich-club edge strength and density. Rich club edge strength and density were further significantly correlated with fighters’ psychomotor speed.
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