Figure 6:

Solid lines show the 10-fold sinc-interpolated measured average impulse response to stimuli in the m-sequence experiment for both conventional BOLD (red) and CBVw signal (blue). These measured responses are affected by any interaction between consecutive closely-spaced stimuli in the paradigm. These interaction terms are separated during m-sequence analysis, see (de Zwart 2009). Time-courses for the interaction terms between two directly adjacent ‘on’ stimuli (200 ms inter stimulus interval) are shown using long strokes. These interaction terms can be used to correct the measured IR, yielding the IR to an isolated 800 ms visual stimulus (short strokes). The later correspond to the curves shown in Figure 3. The timing of the 800 ms stimulus is shown in yellow. Standard error over volunteers is shown in green (one-sided) and is omitted for the average response traces since those data are shown in Figure 3.