Decreases in low-frequency power -- and accompanying increases in cortical information representation -- could more fundamentally reflect modulations in attention. For example, active whisking in rodents causes a decrease in low-frequency power in stimulated barrel cortex [75,76]. In primates, directed attention to a visual receptive field tends to decrease low-frequency power, suggesting a link between attention, power, and reduced neural noise correlations [77]. Attention-related decreases in low-frequency power would also be consistent with studies that have found the spectral tilt during successful states in non-mnemonic tasks, such as audiovisual judgment or mathematical problem solving [78–80].
