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. 2014 Sep 7;281(1790):20141137. doi: 10.1098/rspb.2014.1137

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© 2014 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 7. — Various configurations for discriminating relative numerosity of two classes of element in the same texture. Each panel is labelled with the Weber fraction of one observer (M.J.M.) along with the (bracketed) prediction of a filter energy ratio model. The cases are (a) contrast polarity, (b) spatial frequency (×2), (c) contrast (×2), (d) phase (90°), (e) orientation (90°) and (f) size (×2). In the case of phase, the psychometric function was flat. The numbers in the bottom left of each panel indicate the observer's Weber fraction followed by that of the model. The key ‘P’ in panel (e) indicates that model performance was perfect.