Fig. 2From: An examination of sleep spindle metrics in the Sleep Heart Health Study: superiority of automated spindle detection over total sigma power in assessing age-related spindle declineAÂ Distribution of mean sigma power over either all of NREM2 sleep (N2 sigma), or restricted to automated spindle detections (spindle sigma). BÂ Distribution of mean sigma coherence calculated by NREM2 sigma sleep or spindle sigmaBack to article page