Although in Experiments 1 and 2 , the decrease in performance at the boundary location (−0.51 degrees) did not reach statistical significance, this is possibly due to large error variances and lower statistical power in a between-subject experimental design.
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Increasing perceptual separateness affects working memory for depth - re-allocation of attention from boundaries to the fixated center.
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The sentences
Because the difference was marginally significant for target depth of 0 degrees and +0.17 degrees, we think that there might be a weak effect for 0 degrees and +0.17 degrees, and it was possible that significant difference only occurred for the joint effect of these two target depths.