Figure 8.

Modulation of alpha power confirms attentional effects, but modulation is not sufficient to predict attentional state across individuals. Top, Alpha power is modulated by attention independent of stimulus, modality, or viewing condition. It is stronger for auditory-only stimuli, but does not differ between free and constraint viewing. Bottom, Classification performance between attend and count condition based on alpha power. Given the variability of alpha across subjects, the observed modulation with attention is not strong enough to distinguish attentional state across subjects (gray area indicates chance performance).