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Averaged COI hemodynamic response signal for each task (DMTS and DST) and trial type (WM and control). The thick line represents the group-by-group mean of hemodynamic response signal, and the shaded area represents the 95% confidence area. DMTS: Delayed Match-To-Sample task; DST: Digit Span Test; WM: working memory; AD: Alzheimer’s disease; HC: healthy controls; MCI: mild cognitive impairment; ΔHbO: change in oxy-hemoglobin; ΔHbR: change in deoxy-hemoglobin.
