Comparison between three 1-d filters and one 3-d filter in experimental data.

<p>The blue overlay shows the combined output of three 1-d filters whilst the green overlay shows the combined output of one 3-d filter. Images are shown in radiological convention. Subfigure (a) shows -maps between active and passive normalised power measures in a somatosensory stimulation experiment. Arbitrary thresholds were applied to only show the peak in the map. In blue are regions with a t-value between 10.5 and a maximum of 12 and in green between 3 and a maximum of 4.5. Subfigure (b) shows maps evaluating the 4 Hz Fourier component in an auditory steady state following response. Arbitrary thresholds were applied to only show the peak in the map. In blue are regions with a t-squared value between 550 and a maximum of 900 and in green between 350 and a maximum of 450.