Figure 1.

Breakdown of long-range temporal spiking correlations during NREM sleep in frontal and parietal cortex. a, In frontal cortex, spike count autocorrelation (AC) decays rapidly in NREM sleep, whereas other vigilance states have similar slow decays. Mean AC over animals (n = 13; SEM; SUA; frontal cortex; Q, R, N). b, Summary of decay rates obtained from exponential fits over the whole autocorrelation function. c, d, Changes in autocorrelation decays observed in neurons maintaining a similar firing rate across vigilance states (c) and in neurons exhibiting a strong change in firing rate from wake to NREM sleep (d). e–h, Breakdown of long-range temporal spiking correlation in NREM sleep in parietal cortex. Equivalent analysis as in a–d. All analyzed data are from dataset 2. ★ indicates a significance value p < 0.05.