Table 2.
Details of unit behavior
| Percentage of units with coupling to θ or Resp | |||||||
|---|---|---|---|---|---|---|---|
| Unit type | Property | Test | p | ||||
| All except None | θ-states > non-θ states | Chi-square | < 0.0001 | ||||
| All except None | REM < AW | Chi-square | 0.0017 | ||||
| θ + Both | REM > AW | Chi-square | 0.0007 | ||||
| Resp + Both | REM < AW | Chi-square | < 0.0001 | ||||
| Resp + Both | WI = NREM | Chi-square | 0.6541 | ||||
| Dependence of coupling on firing rate | |||||||
| Unit type | State | Property | Test | p | |||
| θ + Both | REM | ↑ with firing rate | Chi-square | < 0.0001 | |||
| θ + Both | AW | no change | Chi-square | 0.9971 | |||
| Resp + Both | REM | ↑ with firing rate | Chi-square | 0.003 | |||
| Resp only | NREM | ↑ with firing rate | Chi-square | < 0.0001 | |||
| Resp only | AW | ↑ with firing rate | Chi-square | 0.0008 | |||
| Resp only | WI | no change | Chi-square | 0.1052 | |||
| Coupling strength: θ versus Resp | |||||||
| Unit type | Rhythm | Property | Test | p | |||
| θ only | θ | REM > AW | Mann–Whitney | 0.0136 | |||
| Both | θ | REM = AW | Mann–Whitney | 0.9476 | |||
| sR only | Resp | REM > NREM | Dunn’s multiple comparison | < 0.0001 | |||
| sR only | Resp | REM = WI | Dunn’s multiple comparison | > 0.9999 | |||
| sR only | Resp | NREM < WI | Dunn’s multiple comparison | < 0.0001 | |||
| fR only | Resp | REM > AW | Dunn’s multiple comparison | < 0.0001 | |||
| fR only | Resp | WI > AW | Dunn’s multiple comparison | < 0.0001 | |||
| fR only | Resp | REM = WI | Dunn’s multiple comparison | 0.4658 | |||
| State | Rhythm | Property | Test | p | |||
| REM | θ | θ only > Both | Mann–Whitney | 0.0028 | |||
| WI | Resp | sR only < fR only | Mann–Whitney | 0.0013 | |||
| REM | Resp | sR only = fR only | Mann–Whitney | 0.9421 | |||
| Phase preference | |||||||
| Unit type | Property | Test | p | ||||
| θ + Both | REM vs. AW/ different | Watson U2 | < 0.0001 | ||||
| sR only | REM vs. NREM/ different | Watson U2 | < 0.0001 | ||||
| sR only | NREM vs. WI/ different | Watson U2 | < 0.0001 | ||||
| sR only | REM vs. WI/ not changed | Watson U2 | 0.1955 | ||||
| fR only | REM vs. WI/ different | Watson U2 | 0.0223 | ||||
| fR only | REM vs. AW/ different | Watson U2 | 0.0058 | ||||
| fR only | WI vs. AW/ different | Watson U2 | < 0.0001 | ||||
| Phase preference in Both units | |||||||
| State (depth) | Property | Test | p | ||||
| AW (all) | θ only vs. Both/ different | Watson U2 | 0.0146 | ||||
| AW (deep) | fR only vs. Both/ different | Watson U2 | 0.0156 | ||||
| REM (deep) | θ only vs. Both/ different | Watson U2 | 0.0314 | ||||
AW active waking; WI wake immobility; NREM non-REM sleep; REM REM sleep; both units modulated by both rhythms (θ and respiration) simultaneously; θ units modulated by θ; Resp units modulated by respiration; fR units modulated by fast respiration; sR units modulated by slow respiration; None units not modulated, neither by θ nor by respiration; all units in all layers (0–0.8 mm); deep: units in deeper layers (0.4–0.8 mm)