Figure 4.

Grand mean source reconstruction results. A, For γ pattern III (120–140 Hz, 400–600 ms), which showed the attention effect, activations were found bilaterally in regions covering the sensorimotor cortex. B, For the early evoked δ pattern V (3 Hz, 0–200 ms), the correlate of the attention effect was observed in regions more dorsal and only at the contralateral sensorimotor cortex. C, For the same pattern V, which showed significant effects for the stimulus intensity, activation was also found at the contralateral sensorimotor cortex.