FIGURE 1. Schematic illustration of time course of PET and fTCD measurements. Test conditions followed in order 0-back (reference condition) to 2-back (activation condition): R = rest with fTCD acquisition but without activation; x-back = simultaneous PET-fTCD acquisition under 0-back (reference condition) or 2-back task; P = pause without any acquisition for isotope washout (PET).

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