Flash fusion task
Similar to the original study, we found a moderate correlation between
peak alpha frequency from eyes-closed EEG data and flash-fusion
thresholds. Following the original paper’s methods for pre-stimulus EEG
recording analysis, we analysed the electrode that showed the highest
amplitude in the alpha band range for pre-stimulus EEG recording for
each participant, and found no correlation between peak alpha frequency
and flash fusion thresholds for pre-stimulus EEG recordings. However,
regions with high alpha power during visual task performance might not
be indicative of the areas where focused, fast temporal processing might
be taking place. We therefore also analysed electrode B7, which had the
highest alpha band amplitude for most participants during eyes-closed
EEG recording. For electrode B7, we found a moderate correlation between
pre-stimulus peak alpha frequency and flash fusion thresholds.
Consistent with Samaha & Postle’s findings, flash-fusion thresholds
were not correlated with either eyes-closed or pre-stimulus peak alpha
power.