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. 2013 May 20;4:37. doi: 10.3389/fpsyt.2013.00037

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Copyright © 2013 Egaña, Devia, Mayol, Parrini, Orellana, Ruiz and Maldonado.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.

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Probability density function (PDF) for fixation durations for each image category. (A–D) These plots are a smoothed representation of the binned histograms. HC subjects show a narrower distribution for fixation durations using the SR algorithm for image categories with the largest complexity. The distribution for construction was significantly different from all others; landscapes and fractals were similar but different to the other categories which were similar to each other (Kolmogorov–Smirnov, p = 0.05). When we employed the EM algorithm, we found that the mode of their distribution changes slightly, with a largest proportion of the fixation duration seen for durations below 200 ms. However, statistical differences between these curves remain identical to those observed for the SR algorithm.