Allison B Sekuler, Carl M Gaspar, Jason M Gold, Patrick J Bennett 

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Inversion Leads to Quantitative, Not Qualitative, Changes in Face Processing  Allison B Sekuler, Carl M Gaspar, Jason M Gold, Patrick J Bennett  Current Biology  Volume 14, Issue 5, Pages 391-396 (March 2004) DOI: 10.1016/j.cub.2004.02.028

Figure 1 Face Stimuli and Ideal Observer Templates Stimuli were one pair of female faces (A and B) and one pair of male faces (D and E). The most discriminative regions within each face pair are shown in the ideal observer classification images (C and F). Current Biology 2004 14, 391-396DOI: (10.1016/j.cub.2004.02.028)

Figure 2 Smoothed Classification Images Sample classification images for female faces (ALG [A and B]) and male faces (KAT [C and D]). The left column shows results for upright faces, and the right column shows results for inverted faces (rotated 180°). For computation of smoothed classification images, raw classification images were convolved with a 5 × 5 convolution kernel (the outer product of [1, 2, 3, 2, 1]T). Blue rectangles show the 71 × 29 pixel region surrounding the eyes and eyebrows in the original face images (12.6% of the total pixels). Current Biology 2004 14, 391-396DOI: (10.1016/j.cub.2004.02.028)

Figure 3 Significant Pixels and Cross-Correlation Results Statistically significant pixels from classification images derived across all trials for all observers for (A) female and (B) male faces superimposed on a low-contrast version of the ideal observer classification image. Red pixels indicate significance (p < 0.001) for upright faces, green for inverted, and yellow for both. (C) Correlations between human and ideal classification images differed significantly across orientation. Open red bars show results for upright faces, filled green bars for inverted. Missing bars represent values at (SKH) or below (GBN, −0.002) the abscissa. (D) There were no consistent differences in the number of significant pixels across orientation. Symbols are as in (C). The missing bar represents a value at the abscissa. Current Biology 2004 14, 391-396DOI: (10.1016/j.cub.2004.02.028)

Figure 4 Relationship between Predicted and Obtained Absolute Efficiencies Each point represents results from a single observer's classification image for upright (open red) and inverted (filled green) face discrimination. Observed efficiency was strongly correlated with predicted efficiency, and the relationship was constant across orientations. Current Biology 2004 14, 391-396DOI: (10.1016/j.cub.2004.02.028)