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. 2014 Jul 7;9(7):e101567. doi: 10.1371/journal.pone.0101567

Figure 1. Circular histograms showing algorithm performance for up- (blue) and down-targeted (red) sound stimuli, both within single subjects and across all trials (right).

Figure 1

Arrows indicate average phase angle; 90 degrees corresponds to the peak of the up state, 270 degrees to the trough of the down state.