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Attentional modulation of prestimulus neuronal activity. A, LFP power spectra from a representative channel. B, Comparison of averaged LFP alpha power. C, Comparison of averaged MUA. For both LFP alpha power and MUA, a normalization procedure was performed for each recording channel before averaging across channels, according to the following formula: condition/(attend-visual + ignore-visual). Error bar denotes the SEM. AV, Attend-visual; IV, ignore-visual (attend-auditory).
