The interaction between luminance polarity grouping and symmetry axes on the ERP responses to symmetry.

As for rotation symmetry ( Figure 9 ), we found marginally significant effects of time window (F(1,23) = 4.281, p = 0.05, η p 2 = 0.157) and angle (F(2.56, 58.85) = 2.666, p = 0.065, η p 2 = 0.104).

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Analyzing the angular differences for rotation, no effects approached significance (all p’s > 0.093).

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Further, the N1 did not respond to angular differences between reflection symmetry and polarity axes, but there was weak evidence for a larger N1 in PO8 compared to PO7 (F(1,23) = 4.255, p = 0.051, η p 2 = 0.156), with no other effects approaching significance in this model (all p’s > 0.238).

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