Does alpha phase modulate visual target detection? Three experiments with tACS-phase-based stimulus presentation.

In the post hoc analysis of reaction times, we observed a marginally significant ( R 2 = 0.53, p = .08) effect of tACS phase on reaction times for left hemifield targets, but not right ( R 2 = 0.08, p = .35).

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This test did not reject the null hypothesis for hit rates (left hemifield: t (9) = −0.37, p = .64, right hemifield: t (9) = −0.27, p = .60), with a statistical trend for reaction time (RT) for left hemifield targets (left hemifield: t (9) = 1.45, p = .09, right hemifield: t (9) = 0.30, p = .38).

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Thirdly, our post hoc additional analysis evaluated modulation of reaction times (RT) by alpha tACS phase, and here specifically in left hemifield, there were four participants with significant modulation (plus another approaching significance), versus three in the right hemifield. 3.2 Group analyses It is difficult to credit so many individual statistical tests or to draw generalized conclusions from them.

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