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. Author manuscript; available in PMC: 2013 Feb 15.
Published in final edited form as: Neuroimage. 2011 Nov 17;59(4):3128–3138. doi: 10.1016/j.neuroimage.2011.11.028

Figure 4.

Figure 4

The result of the HRF simulation applied across all cortical voxels for HbO, HbR, HbO & HbR and synthetic NIRS models as a function of the number of NIRS channels applied. The corresponding results for the pulse and respiration RETROICOR model are also included. Figure 4a shows the mean-squared error (MSE) between the synthetic and recovered HRFs, normalized to the value obtained by the reference model. For clarity, the normalized MSE for up to ten NIRS channels are shown on a larger scale on the inserted axes. Figure 4b shows Pearson’s correlation coefficient (R2) between the synthetic and recovered HRFs. The mean changes in MSE and R2 for the RETROICOR model compared to the reference model are negligibly. In each figure the error bars (and shaded region for the RETROICOR model) represent the standard deviation across all runs.