This analysis was based on mean ERP amplitude measured from 280 to 360 ms post-stimulus and revealed a significant interaction between the electrode location and color-repetition factors, demonstrating a reliable increase in target-elicited N2pc amplitude in Fig. 1b
(F(1,11) = 5.385, p = 0.041). In addition a main effect of target position was identified (F(1,11) = 10.317, p = 0.008), reflecting a larger N2 component over the right visual cortex; this effect is unimportant for the purposes of the present study. No other effects were significant (electrode location: F(1,11) = 1.729, p = 0.215; color repetition: F(1,11) = 2.295, p = 0.158; all other Fs < 1). Analysis based on peak amplitude observed at the peak of the N2pc illustrated in Fig. 1b garnered similar results (electrode location × intertrial
condition: F(1,11) = 6.339, p = 0.029; target position: F(1,11) = 12.887, p = 0.004; color repetition: F(1,11) = 1.468, Ivacaftor datasheet p = 0.251; all other Fs < 1). A second 3-way RANOVA was conducted to demonstrate that the distractor-elicited N2pc observed in the swap condition (Fig. 4c) was reliably different from the ERP elicited through the same period in the no-swap condition (Fig. 1b). This analysis was based on mean ERP amplitude measured from 380 to 400 ms. An interaction between electrode location and color repetition factors was revealed, reflecting a reliable increase in late distractor-elicited N2pc amplitude in Fig. 3c (F(1,11) = 5.697, selleck compound p = 0.036). A main effect of target position was also identified (F(1,11) = 10.217, p = 0.009), as was a main effect of color repetition (F(1,11) = 5.080, p = 0.046). The latter reflects an average increase in positivity through the tested latency period in the swap condition possibly caused by an increase in early aspects of the P3a in swap trials. No other effects were significant
(electrode location: F(1,11) = 3.665, p = 0.082; all other Fs < 1). Analysis based on amplitude observed at the peak of the late, distractor-elicited mafosfamide N2pc illustrated in Fig. 4c garnered similar results (electrode location × intertrial condition: F(1,11) = 8.116, p = 0.016; target position: F(1,11) = 9.668, p = 0.010; color repetition: F(1,11) = 4.236, p = 0.064; all other Fs < 1). This study was motivated by the idea that the type of perceptual ambiguity suggested by Olivers and Meeter, 2006 and Meeter and Olivers, 2006) as underlying feature priming might be the same type of ambiguity that Luck et al., 1997a and Luck et al., 1997b propose is resolved by the attentional mechanisms reflected in the N2pc. Consistent with this hypothesis, our results show that including a salient distractor in a compound search task–a manipulation used by Olivers and Meeter (2006) to increase perceptual ambiguity–results in both an increase in intertrial priming and an increase in target-elicited N2pc amplitude at posterior electrode sites (see Fig. 1).
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