Olfactory Bulb Field Potentials and Respiration in Sleep-Wake States of Mice

Figure 4

During NREM sleep only plethysmography reliably reflects respiration except during microarousals. (a) Raw signal of plethysmography (PG), thermocouple (TC), and olfactory bulb local field potential (OB). (b) Time-frequency distribution of the three signals shown in (a). (c) Power spectral density of NREM sleep reveals a clear peak in PG but no corresponding peaks in TC and OB. During microarousals (see asterisks), all three signals indicate respiration.