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. 2011 Apr 6;6(4):e18262. doi: 10.1371/journal.pone.0018262

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Ni et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Inline graphic — The embedded path graph was fitted by the quadratic function in the vertex form of . (A) Coefficient a is positive, therefore all embedded quadratic curves opened upwards. Fitted quadratic curves in embedded path graph of valenced pictures have larger open width; the coefficient a is significantly different across three arousal levels, indicating a non-linear effect of arousal. (B) Coefficient b represents the symmetry axis of the fitted parabola. There was no significant difference between the valence and arousal blocks for coefficient b. (C) Coefficient c represents the height (vertical position) of the fitted quadratic curves. The fitted curves have larger coefficients c in valenced pictures and were significantly different within graded arousal levels, indicating a non-linear arousal effect. (D) Embedded quadratic curves in each affective level of two blocks. Stars mark significant difference (two stars: p<0.01 and three stars: p<0.001; by ANOVA test). Here and denotes the 2^nd and 3^rd eigenvector of the Laplacian matrix, respectively.

The embedded path graph was fitted by the quadratic function in the vertex form of . (A) Coefficient a is positive, therefore all embedded quadratic curves opened upwards. Fitted quadratic curves in embedded path graph of valenced pictures have larger open width; the coefficient a is significantly different across three arousal levels, indicating a non-linear effect of arousal. (B) Coefficient b represents the symmetry axis of the fitted parabola. There was no significant difference between the valence and arousal blocks for coefficient b. (C) Coefficient c represents the height (vertical position) of the fitted quadratic curves. The fitted curves have larger coefficients c in valenced pictures and were significantly different within graded arousal levels, indicating a non-linear arousal effect. (D) Embedded quadratic curves in each affective level of two blocks. Stars mark significant difference (two stars: p<0.01 and three stars: p<0.001; by ANOVA test). Here and denotes the 2^nd and 3^rd eigenvector of the Laplacian matrix, respectively.