Table 1. . Summary of imaging findings after one season of subconcussive impacts in contact sports.

Modality	Metric	Type of change	Literature	Ref.
fMRI	BOLD	Altered network	Abbas et al. (DMN); Talavage et al. (working memory)	[46,47]
	ASL	Expected decreases or increases	None known yet for subconcussive; Maugan et al. (decrease TBI); Militana et al. (increase TBI)	[51]
MEG	Delta waves	Increases	None known yet for subconcussive; Huang et al. (concussive)	[55]
DTI	FA	Increases and/or decreases	Bazarian et al.; Davenport et al.	[5,21]
	MD	Increases and/or decreases	Bazarian et al.	[21]
DKI	MK and others	Increases and/or decreases	Davenport et al.	[73]

ASL: Arterial spin labeling; BOLD: Blood oxygen level dependent; DKI: Diffusion kurtosis imaging; DMN: Default mode network; DTI: Diffusion tensor imaging; FA: Fractional anisotropy; fMRI: functional magnetic resonance imaging; MEG: Magnetoencephalography ; MK: Mean kurtosis; TBI: Traumatic brain injury.