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. 2013 Nov 6;4:790. doi: 10.3389/fpsyg.2013.00790

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Copyright © 2013 Marozeau, Innes-Brown and Blamey.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Replots the difficulty ratings from Experiment 1, but with a different abscissa based on a perceptual scale determined from dissimilarity ratings (Experiment 2). The error bars show the standard error of the mean.