Fig. 1.

An example of a design matrix X. As described in Sec. 2.4, a peak delay was set as ${\tau }_p=6\mathrm{s}$. The row number indicates the number of samples. The first, second, third, and fourth columns indicate the canonical HRF $f({\tau }_p,t)$, the derivatives, the second derivatives, and the constant, respectively.