7a ), mixed-effects models (see Methods) revealed a highly significant influence of the power in the δ band (<5 Hz. a good proxy for slow wave density 45 ) on ITPC values for RefRN trials (comparison with a model not taking into account δ –power to predict ITPC: χ 2 (1) = 19.18, P = 2.2 × 10 −5 ).
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