Comparison between different filtering algorithms for detecting the onset (left) and offset (right) of change points using different number of units (top: C = 12, bottom: C = 24). ex1neg, excluding 1 negatively modulated unit; ex1pos, excluding 1 positively modulated unit; ex2neg, excluding 2 negatively modulated units; ex2pos, excluding 2 positive modulated units. C = 12(+3,– 3) denotes that there are 3 positively and 3 negatively modulated units among 12 simulated units in the full model; similar notation holds for C = 24(+3,– 3).