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Correlations among the undershoot parameters. (A) Strong linear correlation between measured HRF undershoot amplitude and HRF slope at undershoot onset. (B) Correlation between predicted CBF amplitude and HRF slope at undershoot onset. (C) Correlation of predicted CBF slope at undershoot onset with HRF slope at undershoot onset. (D) No significant correlation between HRF undershoot amplitude and CBF undershoot amplitude is observed.
