Figure 3.

Time-frequency (TF) decomposition: Theta. (A) Grand average waveform plotted at Cz. (B-G) TF-PCA decomposition of theta band pass filtered data. (H-M) Theta time-frequency condition differences: Time-frequency surfaces and headmaps are plotted with a midpoint of 0, red reflecting a positive difference, and blue reflecting a negative difference. (B) Theta filtered (1–6 Hz) grand average ERP time-domain waveform. (C) TF grand average of the theta filtered data. (D) Scree plot of singular values which was used to determine a three factor theta solution (red circles depict extracted components that account for 39.65% of the variance). (E) TF theta principal component 1, reflecting post N400 theta activity (e.g., theta activity concomitant with the P300). (F) TF theta principal component 2, reflecting theta activity corresponding to the initial N400 negativity. This component was selected for further analysis. (G) TF theta principal component 3, reflecting pre - N400 theta activity (e.g., theta activity concomitant with the the N1 or P2). (H) Largely non-significant differences in activation for theta component 1 between familiar and less-familiar condition. Topographical depiction of mean theta activation differences (amplitude and statistical maps) between familiar and less-familiar conditions. (I) Largely non-significant differences in activation for theta component 2 between familiar and less-familiar condition. (J) Largely non-significant differences in activation for theta component 3 between familiar and less-familiar condition. (K) Non-significant differences in activation for theta component 1 between inferred and neutral condition. (L) Significant differences in activation for theta component 2 between inferred and neutral condition. (M) Non-significant differences in activation for theta component 3 between inferred and neutral condition.