Figure 12. Model matrices for testing trial n-1 element codes, trial n element codes, and conjunctions between trial n-1 and trial n codes (a) and the results of testing each of these matrices across frequency bands and trial phases (b).

(a) Model matrices that describe the similarity structure by the variation in trial n-1 elements, trial n elements, or the conjunction between trial n-1 and n elements (see the text for details). Black cells in the model matrices represent a theoretically expected correct classification probability of p = 1.0, gray cells of p = 0.5, and white cells of p = 0. (b) T-values associated with regression coefficients for each of the three model predictors are shown separately for the preparation and the probe period and for the theta- and alpha-band.