The hemodynamic initial-dip consists of both volumetric and oxymetric changes reflecting localized spiking activity.

Front Neurosci · 2023 · PMC10248142 · PMID 37304038

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all but significantno p-value reported

Furthermore, within trials with low spiking activity, even though we do not see significant changes in the slope of the HbO and HbR signals, we do find small but significant changes in their concentration (see Supplementary Figure 5 ).

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