Figure 1.
Sequence of stimulus events in the speeded flanker task. Participants viewed four task-irrelevant flanker arrows, followed by a central arrow that indicated the response direction and pointed to the same or opposite direction as flanker arrows. Compatible (same direction) and incompatible (opposite direction) trials appeared in randomized order and with the same probability. For trials in which subjects responded slower than a dynamically adapting individual response deadline, a symbolic feedback occurred urging the subject to speed up in consecutive trials.