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The effect of heart rate variability (CRV). (A) Maps of correlations between the regular TR BOLD signals and the convolved CRV (CRV-CRF) are overlaid on the FreeSurfer cortical model, averaged across nine subjects. SE-EPI exhibited lower CRV sensitivity than GE-EPI. (B) Gray matter averaged correlations between CRF-CRF and the BOLD signal for both regular (long) TR and short TR data. The group-level differences were statistically significant for both TRs.
