Fig 9. LFP phase and power provide independent and additive information for vocalization classification.

Channel-adding curves calculated by repeatedly training classifiers with an increasing number of randomly selected channels (see Methods). (A-C) Channel-adding curves showing classifier performances with either (A) all LFP phase information removed, (B) all LFP power information removed, or (C) with both phase and power used as independent features. Each row corresponds to data from the highest-yield day for each bird. These vocal and non-vocal classification events are collectively referred to as classes (see Methods). z007 n = 98 for each of 7 classes (1, 2, 3, 4, 5, i (introductory note), Silence); z020 n = 91 for each of 6 classes (1, 2, 3, 4, i (introductory note), Silence); and for z017 n = 52* for each 8 classes (1, 2, 3, 4, 5, 6, 7, Silence). The results of up to 15 channels are shown to allow for direct comparison across subjects. Dark lines show the mean for each vocalization class, shaded areas give the standard deviation over the bootstrapped analysis using n = 5,000 repetitions across 5 cross-validation folds. The p-value for all of the binomial chances calculated for each bird was 0.05. *The number of instances for each class was limited by Syllable 7, which is an intra-motif note.