ERPs Elicited by Target Stimuli

In each task, the target stimuli elicited large P300 components that were maximally positive at the centroparietal site (Pz). Although the P300 elicited by target stimuli were not at the focus of this study, in the absence of any objective measure of task difficulty we analyzed the amplitude and peak latency of this component (Figure 9 and Table 3). Moreover, as will become clear in the general discussion, the comparison of the latency and the amplitude of the P300 across tasks enhanced our understanding of the cognitive processes involved in each task.