Extended Data Fig. 4. Decoding across cortical regions.

Cortical regions for subjects S1 and S2. (a) Brain data used for decoding (colored regions) were partitioned into the speech network, the parietal-temporal-occipital association region, and the prefrontal region (PFC). (b) Decoding performance time-course for the perceived speech test story from each region. Horizontal lines indicate when decoder predictions were significantly more similar to the actual stimulus words than expected by chance under the BERTScore metric ($q\left(\text{FDR}\right)<0.05$, one-sided nonparametric test). Corresponding results for subject S3 are shown in Figures 2a and 2c in the main text.