The necessity to choose causes reward-related anticipatory biasing: Parieto-occipital alpha-band oscillations reveal suppression of low-value targets.

For posterior beta, there was no effect of choice-trial proportion or time window, but the interaction fell just short of statistical significance (F (2,50) = 3.10, p = 0.054, partial ƞ 2 = 0.11).

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The same correlation was computed for the lateralized beta power increase in the early time window of the 75% choice-trial condition, which was borderline significant (see section lateralized alpha and beta power ).

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