which determined both the FFT frequency resolution (sampling frequency/number of samples = 200/256 = 0.78125) and the resulting ERSP time interval (epoch start + subwindow length/2 .. epoch end subwindow length/2 = −200 + 80 .. 1000 – 80 = −120 .. 920 ms). These frequency-by-time (128-by-200) matrices were reduced via bilinear interpolation (Matlab function interp2.m) to 30-by-82 matrices to directly reflect spectral (1 to 30 Hz in steps of 1 Hz) and temporal (−10 to 800 ms in steps of 10 ms) ranges of interest.
