Mean ± SEM of parameters for basal and apical dendritic single-pulse response (n = 10 rats, each group)
| Basal | Apical | p | |
|---|---|---|---|
| Stimulus Intensity (μA) | 402 ± 49 | 251 ± 66 | NS |
| ES onset (ms) | 3.63 ± 0.21 | 3.20 ± 0.19 | NS |
| ES slope (mV/mm2) | –163 ± 21 | –383 ± 33 | <0.001 |
| ES slope ratio (non-θ/θ) | 1.09 ± 0.02 | 1.20 ± 0.04 | <0.05 |
| PS peak latency (ms) | 5.60 ± 0.16 | 5.65 ± 0.26 | NS |
| PS peak amplitude (mV/mm2) | 299 ± 56 | 549 ± 118 | <0.03 |
| PS amplitude ratio (non-θ/θ) | 0.83 ± 0.03 | 1.64 ± 0.12 | <0.001 |
| Curve-fit of PS-θ phase with sum of harmonics | |||
| A0 | 0.972 ± 0.013 | 0.989 ± 0.004 | NS |
| A1 | 0.132 ± 0.026 | 0.098 ± 0.0151 | NS |
| A2 | –41.3 ± 11.1° | –49.90 ± 8.23° | NS |
| B1 | 0.042 ± 0.007 | 0.046 ± 0.008 | NS |
| B2 | 22.8 ± 19.1° | 6.7 ± 21.0° | NS |
| B1/A1 | 0.36 ± 0.05 | 0.60 ± 0.15 | NS |
| R2 | 0.55 ± 0.06 | 0.53 ± 0.07 | NS |
PS sink amplitude and ES slope (in CSD units of mV/mm2) were evoked at a stimulus intensity of 1.5 times the PS threshold. The average amplitude/slope measures were determined during a θ state (averaged across all phases) or non-θ state. PS amplitude and ES slope, and their respective ratio in non-θ-to-θ state were statistically different between basal and apical dendritic measures. Scatter plot of single sweep PS (y) with SLM θ phase (x) at stimulus onset, were fitted by equation y = [A0 + A1 sin (π* (x + A2)/180) + B1 sin (π* (x + B2)/90)], where A0 = constant, A1 = 1st harmonic modulation, A2 = 1st harmonic phase shift, B1 = 2nd harmonic modulation, and B2 = 2nd harmonic phase shift. R 2 describes the goodness of fit. Probability (p) of equality between basal and apical groups was tested by unpaired Wilcoxon; NS, non-significant, p > 0.05.