Fig. 2: Phase locking in the alpha band. | Communications Biology

Fig. 2: Phase locking in the alpha band.

From: Biophysical mechanism underlying compensatory preservation of neural synchrony over the adult lifespan

Fig. 2

a Overview of the analysis pipeline: rsMEG sensor space data was projected to source space. PSD for each ROI was extracted using Welch method and modeled as a linear superposition of periodic and aperiodic components. Peak frequency was extracted for each brain region and averaged across ROIs to obtain a single mean peak alpha frequency for each subject. Mean peak alpha frequency was found to be negatively correlated with age. Subsequently, phase locking was estimated for each subject using both PLV and PLI. b Phase Locking Value (PLV) and Phase Lag Index (PLI) estimated for three frequency bands- LA (6–10 Hz), SSA (PAF − 2 to PAF + 2) and UA (10–14 Hz). c PLV and PLI box plot for LA, SSA and UA band, for each box N = 627. Width of the notch is proportional to the interquartile range. Dots represent data points. d Schematic: PLV, PLI analysis suggests frequency reorganization that preserves alpha phase locking at reduced peak frequencies.

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