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. 2015 Jun 24;9:353. doi: 10.3389/fnhum.2015.00353

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Copyright © 2015 O'Reilly and Nielsen.

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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The left panel shows six common situations [labeled as (a–f)] occurring when comparing the detection of a gold standard scorer (Gold) with another scorer (Test). The x-axis on these plots represents time. On the y-axis, a high (low) value indicates the presence (absence) of a spindle. For example, case (a) shows perfect agreement between the gold standard and the tested scorer. Resulting assessments (TN, TP, FP, and FN, in percent) for the proposed signal-sample-based approach and for the window-based method used in Devuyst et al. (2011) are given in rightward panel. Note: The length of the scored signal is taken as being 1 s, such that there is only one decision taken for the window-based method, whereas there are f_s decisions for the signal-sample-based method.