This study investigated the effects of flicker on concurrently recorded visual event-related potentials (ERPs) to visual performance in Stroop and sentence reading tasks.
Three flicker rates were presented (0, 100, and 500 Hz) in separate blocks of trials while ERPs were recorded and participants performed these tasks.
Source analysis revealed the 500 Hz response had similar mean source activation for incongruent and congruent tasks and 100 Hz had significantly higher activation for the incongruent task at the early latencies (left hemisphere) and for 170-210 ms (right hemisphere). Overall
activation localized to the pulvinar nucleus.
Source analysis localization suggests that 500 Hz flicker affected the secondary visual pathway. Source activation for 500 Hz was not significantly different for congruent and incongruent trials whereas 100 Hz resulted in higher activation in the Stroop task suggesting more effort was required to complete this task. The data suggest important influences of flicker on performance.