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. 2014 Dec 26;9(12):e115658. doi: 10.1371/journal.pone.0115658

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© 2014 Murata et al

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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The period, κ_c, of the distribution of image difficulty, M_c, was determined to be 1.44 according to the same procedure as that in Fig. 4. Inset: ratios of observed decimal fractions of M_c/κ_c (error bars indicate SEM). The ratio in the quarter interval centered at 0 was significantly larger than those at 0.25, 0.5, and 0.75 (paired, one-tailed z test for two population proportions [57], n = 90, *, **). Values of M_c/κ_c were rounded to the nearest natural numbers to be used as the numbers for the missing components, ν_c, in the model. Although the three smallest values of M_c/κ_c were rounded to , these were regarded as because the search times in case of should be zero after application of the interval correction but this was evidently not the case for their corresponding stimuli (Fig. 2A).

Inline graphic — The period, κ_c, of the distribution of image difficulty, M_c, was determined to be 1.44 according to the same procedure as that in Fig. 4. Inset: ratios of observed decimal fractions of M_c/κ_c (error bars indicate SEM). The ratio in the quarter interval centered at 0 was significantly larger than those at 0.25, 0.5, and 0.75 (paired, one-tailed z test for two population proportions [57], n = 90, *, **). Values of M_c/κ_c were rounded to the nearest natural numbers to be used as the numbers for the missing components, ν_c, in the model. Although the three smallest values of M_c/κ_c were rounded to , these were regarded as because the search times in case of should be zero after application of the interval correction but this was evidently not the case for their corresponding stimuli (Fig. 2A).