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(a) BOLD and (b) CBF responses to the breath-hold task within a grey matter mask. Coloured lines represent individual subject data; black lines reflect the average response across participants. BOLD time-series showed better signal-to-noise than CBF. (c) BOLD CVR (%ΔBOLD/mmHg PET CO2) was strongly associated with CBF CVR (%ΔCBF/mmHg PET CO2) were positively correlated (p = 0.01).
