Fig. 2.

(A) Topographic maps of the MEG signals in ∼10-Hz (left column) and ∼20-Hz frequency bands (right column). The spectra were calculated separately for speaking (top) and listening (bottom) epochs of the conversation. The warmer the color, the stronger is the activity in a particular area. (B) Top row: Mean difference (group average) in 7–13-Hz (left) and 15–25-Hz (right) activity between speaking and listening periods in the conversation; warm colors mark an increase, and cold colors a decrease in the activation during speaking compared with listening periods. Black rectangle surrounds the four MEG sensors that were used to calculate the individual suppression strengths. Bottom row: statistical significance map (t-values) between speaking and listening conditions. White crosses mark the sensors where the difference was statistically significant (p < 0.05).