Figure 1

source-level. Schematic illustration based on conceptual data of the hypothesised variability in SSVEP amplitude during rhythmic flicker stimulation relative to the IAF. First row, three possible variations in SSVEP amplitude profiles to rhythmic flicker relative to IAF are shown. All three oscillators show a peak in power at the IAF during resting state eyes closed (shown in blue) but heterogeneity in SSVEP amplitude to rhythmic flicker relative to IAF (shown in orange). Column 1, Variation 1 shows a maximal SSVEP amplitude at the IAF that decreases with stimulation frequencies further from the IAF, which leads to a negative correlation coefficient between the rhythmic flicker frequency as an absolute distance from IAF and the SSVEP amplitude. Column 2, Variation 2 shows no change in SSVEP amplitude as a function of the rhythmic flicker frequency’s absolute distance from IAF, leading to a near-zero correlation coefficient between the SSVEP amplitude and the absolute distance of the rhythmic flicker frequency from IAF. Column 3, Variation 3 shows a minimal SSVEP amplitude at the IAF that increases with stimulation frequencies further from the IAF, which leads to a positive correlation coefficient between the rhythmic flicker frequency as an absolute distance from IAF and the SSVEP amplitude.