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Difference SPs obtained by subtracting pre-sleep from post-sleep SP measures in two sleep groups, Early-NG and Late-NG, for six regions of interest (LFT, left fronto-temporal, LC, left central, LOP, left occipito-parietal, RFT, right fronto-temporal, RC, right central, ROP, right occipito-parietal). Time windows 1 to 8 correspond to 1-s epochs of measurement, with the first one starting 1.5 s after string on-set.
