Polarity-dependent modulation of sleep oscillations and cortical excitability in aging.

Although a slight increase in spectral slope was observed under cathodal so-tDCS relative to sham, this change failed to reach statistical significance ( F (2, 42) = 6.121, p = 0.005, partial η 2 = 0.226; planed contrast cathodal vs. sham: p -adj = 0.073; Cohen’s d = 0.402).

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Although the SO-epoch interval did not reach statistical significance after a cluster-based permutation test to account for multiple comparisons, the trend clearly indicates an increase in spindle activity during the depolarizing SO up-phase.

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