High and Low Memorable stimuli controlled for low-level image features.

We use the Natural Image Statistical Toolbox [73,74,101] to compare low-level statistics (color, brightness, contrast, and spatial frequency at various energy levels) across the set of 78 High Memorable images and the set of 78 Low Memorable images. The spectral energy levels of 10%, 30%, 50%, 70%, and 90% refer to the percentage of total energy of the spectrum in the image sets (larger percentages encompass the energy levels of lesser percentages). In RGB color space, the “R,” “G,” and “B” denote significance testing within the “Red,” “Green,” and “Blue” color channels, respectively. In Lab color space, “L,” “a,” and “b” denote significance testing within “Luminance,” “a color channel,” and “b color channel,” respectively. At a p-value of p < 0.05, no statistically significant differences were found.
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