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.