Figure 3.

White-noise (WN) paradigm. The IRF to WN sequences can be extracted by cross-correlating the stimuli sequence with the recorded EEG: here, an example IRF is shown from one subject on electrode POz. This is what we did in the first session of our experiment. This IRF can, in turn, be used to reconstruct the brain activity (reconstructed EEG) to any new WN sequence by convolution. This was done in the second session of the experiment. The stimulus fluctuations around the target were removed in the second session to avoid any target masking by the luminance (Fig. 5).