Trial-by-trial co-variation of pre-stimulus EEG alpha power and visuospatial bias reflects a mixture of stochastic and deterministic effects.

Alpha power increased from the first to the final third of the experiment ( t 18 = 3.805, P < 0.001, Cohen's d = 1.171) and was higher over the right than left hemisphere, although this effect did not reach statistical significance ( t 18 = 1.913, P = 0.072, Cohen's d = 0.493).

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