The purpose of the experiments was to constrain the locus of interference in the attentional blink (AB) paradigm. Two visual stimuli, T
1 and T
2, were shown 300 msec apart, and each was followed by a mask. T
1 was an “H,” an “S,” an “ &, ” or a blank field; T
2 consisted of five letters. In Task
1, blank fields and & characters could be ignored, whereas Hs and Ss had to be identified and reported. Task
2 was always to report as many letters as possible from T
2. Task
2 performance was lower when T
1 had to be reported, as expected from the attentional blink phenomenon (AB). The exposure duration of T
2 was also manipulated. More letters could be reported as exposure duration was increased. However, this effect was additive with manipulations of Task
1 processing load that produced the AB effect. Log-linear analyses assuming that effects of T
2 exposure duration and Task
1 load effects occur at functionally distinct stages of processing provided satisfactory fits to the results, suggesting that none of the AB effect occurs as early as those of T
2 exposure duration. The results suggest that the locus of the AB effect is later than the stage(s) of processing affected by exposure duration.
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