The role of unique color changes and singletons in attention capture.

The ANOVA revealed a marginally significant effect for target type, F(1,9) = 4.43, p = .065, due to slightly more errors for when the target was non-unique than when it was unique (5.4 % vs. 3.9 %, respectively).

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In fact, the capture effect is either so small that it is statistically not significant (Experiment 4 b, p = .28), or it is in the opposite direction, even though this indication of an inhibitory effect did not reach statistical significance (Experiment 4 a, p = .12).

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Both main effects, for display size, F(2,18) = 19.28, p < .001, and for target type, F(1, 9) = 15.83, p = .003, were highly significant: RTs increased with display size on average by 22.7 ms/item (from 622, 676, to 713 ms, respectively), and search was 75 ms faster when the target was the unique item compared to when it was the non-unique items.

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