The Primary Visual Cortex Is Differentially Modulated by Stimulus-Driven and Top-Down Attention.

During the stimulus-driven attentional paradigm, the mean correlation values in the beta range (16–24 Hz) obtained for all electrode pairs (in areas 17 and 18) during the correct visual trials (0.63 ± 0.06; Fig 5A , gray boxes) were smaller than those calculated during the (correctly performed) auditory task (0.71 ± 0.05; Fig 5A , black boxes), and this difference was highly significant (n = 20 electrode pairs, P = 0.002, paired t-test; see also S5 Fig ).

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