Figure 2. The mfVEP stimuli presented 84 M-scaled stimuli to each eye concurrently using the mfPOP dichoptic system.

The figure illustrates the sparse stimuli wherein transient (33 ms) checkerboard stimuli are presented in one of two alternative contrast formats against a mean luminance grey background. The two contrasts can be appreciated by following the check colouring around each ring. The thin black lines were not present and are shown here only to illustrate where checkerboards could appear. The central 1 degree contained a red fixation cross. Recording run duration was 240 seconds divided into eight segments of 30 s.