Action potential parameters of OB dopaminergic neurons
| Parameter | Monophasic mean ± SEM (n) | Biphasic mean ± SEM (n) | Effect p value | ||||
|---|---|---|---|---|---|---|---|
| 10 mm NaCl | 10 mm KCl | 10 mm NaCl | 10 mm KCl | Cell type | Treatment | Interaction | |
| Vthresh (mV) | −24.7 ± 1.0 (23) | −27.7 ± 1.1 (21) | −34.2 ± 1.7 (17) | −34.6 ± 1.5 (18) | <0.0001*** | 0.15 | 0.19 |
| Onset rapidness (ms−1) | 3.2 ± 0.3 (23) | 3.2 ± 0.4 (19) | 10.7 ± 1.7 (17) | 9.9 ± 1.1 (18) | <0.0001*** | 0.52 | 0.55 |
| Phase 1 peak amplitude (V/s) | n/a | n/a | 46.1 ± 7.0 (17) | 60.1 ± 10.1 (18) | n/a | 0.27 | n/a |
| Peak rate-of-rise (V/s) | 172 ± 21 (23) | 158 ± 20 (21) | 182 ± 19 (17) | 205 ± 21 (18) | 0.17 | 0.82 | 0.37 |
| Peak voltage (mV) | 34.5 ± 3.4 (23) | 32.0 ± 3.4 (21) | 38.0 ± 2.6 (17) | 40.5 ± 2.2 (18) | 0.14 | 0.77 | 0.32 |
| Action potential width (ms) | 1.06 ± 0.06 (23) | 1.02 ± 0.06 (21) | 1.09 ± 0.07 (17) | 1.00 ± 0.06 (18) | 0.81 | 0.24 | 0.87 |
| Rheobase (pA/pF) | 2.05 ± 0.97 (24) | 1.37 ± 0.56 (26) | 1.40 ± 0.19 (15) | 1.52 ± 0.27 (15) | 0.001*** | 0.84 | 0.66 |
| Afterhyperpolarization (mV) | −53.4 ± 1.5 (24) | −55.5 ± 1.2 (26) | −54.1 ± 1.3 (15) | −57.0 ± 1.4 (15) | 0.63 | 0.12 | 0.53 |
| Maximum frequency (Hz) | 16.7 ± 1.8 (32) | 19.0 ± 2.4 (31) | 28.7 ± 4.3 (15) | 35.5 ± 3.8 (16) | <0.0001*** | 0.12 | 0.43 |
| Interstimulus interval CV | 0.17 ± 0.03 (23) | 0.14 ± 0.02 (26) | 0.32 ± 0.06 (13) | 0.26 ± 0.03 (15) | <0.0001*** | 0.60 | 0.40 |
Voltage threshold (Vthresh), peak rate-of-rise, peak voltage, and maximum frequency variables were normally distributed and analyzed with a standard two-way ANOVA. All other variables were non-normally distributed and analyzed with a two-way ANOVA on ranks, except phase 1 peak amplitude—measurable only in biphasic neurons—for which the result of a Mann–Whitney two-sample test is reported.
↵***p ≤ 0.0001.