Schematic representation of the sequence of displays in the RSVP stream.

<p>The two target digits (T1 and T2) were embedded within a stream of distractor letters. Lag was manipulated by varying the number of distractor letters between the target digits. On half of the trials presented at each lag, an irrelevant probe stimulus was presented simultaneously with T2 in the upper-right quadrant of the display.</p

Mean percentage of correct T2 responses as a function of lag, plotted separately for each probe condition.

<p>Error bars represent the within-subjects standard error of the mean.</p

ERP analysis of the C1 component evoked by T2.

<p>(A) Grand average difference waveforms collapsed across electrodes POz, PO4, PO8, Oz, and O2, shown separately for each lag condition. Note that negative is plotted upwards. (B) Medial views of the two cortical hemispheres depicting the estimated current density distribution calculated by sLORETA for the activity observed in the grand average difference waveforms (collapsed across lags) at the peak of the C1 component (87 ms). The regions sLORETA identified as most active are presented in yellow, and fall along the banks of the calcarine fissure in the left hemisphere, corresponding to area V1.</p