Fig. 3 Evaluating the accuracy of speech separation and attention decoding methods. Evaluating the accuracy of speech separation and attention decoding.

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Fig. 3 Evaluating the accuracy of speech separation and attention decoding methods. Evaluating the accuracy of speech separation and attention decoding methods. (A) Comparison of separation between the representation of the two speakers in the T-F (left) and embedding space (right). The axis represents the first two principal components of the data that are used to allow visualization. Each dot represents one T-F bin (left) or one embedded T-F bin (right), which are colored based on the relative power of the two speakers in that bin. (B) Separation accuracy as a function of time. The dashed line shows the time at which the speakers in the mixture are switched. (C) Correlation values between the reconstructed spectrograms (from neural data) and the attended/unattended spectrograms. Correlation values were significantly higher for the attended speaker (paired t test, P < 0.001; Cohen’s D = 0.8), thus confirming the effect of attention in the neural data. The correlation with the clean spectrograms was slightly higher than that with the ODAN outputs, but the differences between the attended and unattended speakers were the same for both clean and ODAN outputs. (D) Attention decoding: The percentage of segments in which the attended speaker was correctly identified for a varying number of correlation window lengths when using ODAN and the actual clean spectrograms. There was no significant difference between using the clean and the ODAN spectrograms (Wilcoxon rank sum test, P = 0.9). (E) Dynamic switching of attention was simulated by segmenting and concatenating the neural data into alternating 60-s bins. The dashed line indicates switching attention. The average correlation values from one subject are shown using a 4-s window size for both ODAN and the actual clean spectrograms. The shaded regions denote SE. (F) The transition time in detecting a switch of attention was calculated as the time at which the correlation difference between the two speakers crossed zero. The average transition time across subjects increased with larger window sizes; however, there was no significant difference between the transition time of ODAN and the actual clean spectrograms (Wilcoxon rank sum test, P > 0.6). Cong Han et al. Sci Adv 2019;5:eaav6134 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).