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. 2009 Mar 27;5(3):e1000329. doi: 10.1371/journal.pcbi.1000329

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Matthias Keil.

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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Symbols denote oriented spectral slopes from the four amplitude spectra (circles = raw, squares = corrected raw, diamonds = Blackman-Harris (B.H.), and triangles = corrected B.H. – see methods section and Figure 1). The solid curve centered in the light-colored area denotes maximum entropy slopes of feature map amplitudes (label “mean (FM)”). The light-colored area indicates ±1 standard deviation. Open symbols indicate where spectral slopes and maximum entropy slopes are significantly different from each other (one-way ANOVA at each orientation, ). Filled symbols denote the opposite case (). A further ANOVA test served to compare whether orientation-averaged slope values were drawn from the same underlying distribution. The respective probabilities are (raw spectrum versus maximum entropy slopes), (corrected raw), (B.H.), and (corrected B.H.). Notice that slope values in the angular domain from 180° to 360° are equivalent to those being shown.

Inline graphic — Symbols denote oriented spectral slopes from the four amplitude spectra (circles = raw, squares = corrected raw, diamonds = Blackman-Harris (B.H.), and triangles = corrected B.H. – see methods section and Figure 1). The solid curve centered in the light-colored area denotes maximum entropy slopes of feature map amplitudes (label “mean (FM)”). The light-colored area indicates ±1 standard deviation. Open symbols indicate where spectral slopes and maximum entropy slopes are significantly different from each other (one-way ANOVA at each orientation, ). Filled symbols denote the opposite case (). A further ANOVA test served to compare whether orientation-averaged slope values were drawn from the same underlying distribution. The respective probabilities are (raw spectrum versus maximum entropy slopes), (corrected raw), (B.H.), and (corrected B.H.). Notice that slope values in the angular domain from 180° to 360° are equivalent to those being shown.