Spontaneous activity patterns in seawater- and freshwater-adapted type 1 Dahlgren cells (extracellular recordings)
| . | Dahlgren cells . | . | |
|---|---|---|---|
| Type of neurons . | SWA . | FWA . | |
| Tonically active | |||
| % of total | 20 | 15 | |
| Mean spike frequency (Hz) | 0.84±0.61 | 0.99±0.64 | |
| Phasically active | |||
| % of total | 20 | 20 | |
| Mean spike frequency (Hz) | 0.27±0.2 | 0.11±0.1 | |
| Maximum spike frequency (Hz) | 1.56±0.68 | 3.7±1.41 | |
| Bursting | |||
| % of total | 60 | 65 | |
| Cycle period (s) | 747.10±277.6 | 831.0±467.3 | |
| Burst duration (s) | 131.90±69.3 | 181.40±255.1 | |
| Mean spike frequency (per 60 min) (Hz) | 0.13±0.1 | 2.10±1.3 | |
| Maximum frequency/burst (Hz) | 1.82±1.17 | 1.31±0.4 | |
| Mean frequency/burst (Hz) | 1.15±0.7 | 1.14±0.5 | |
| Burst acceleration phase duration (s) | 57.70±33.9 | 54.50±39.5 | |
| Burst declaration phase duration (s) | 98.40±48.4 | 122.10±110.6 | |
| . | Dahlgren cells . | . | |
|---|---|---|---|
| Type of neurons . | SWA . | FWA . | |
| Tonically active | |||
| % of total | 20 | 15 | |
| Mean spike frequency (Hz) | 0.84±0.61 | 0.99±0.64 | |
| Phasically active | |||
| % of total | 20 | 20 | |
| Mean spike frequency (Hz) | 0.27±0.2 | 0.11±0.1 | |
| Maximum spike frequency (Hz) | 1.56±0.68 | 3.7±1.41 | |
| Bursting | |||
| % of total | 60 | 65 | |
| Cycle period (s) | 747.10±277.6 | 831.0±467.3 | |
| Burst duration (s) | 131.90±69.3 | 181.40±255.1 | |
| Mean spike frequency (per 60 min) (Hz) | 0.13±0.1 | 2.10±1.3 | |
| Maximum frequency/burst (Hz) | 1.82±1.17 | 1.31±0.4 | |
| Mean frequency/burst (Hz) | 1.15±0.7 | 1.14±0.5 | |
| Burst acceleration phase duration (s) | 57.70±33.9 | 54.50±39.5 | |
| Burst declaration phase duration (s) | 98.40±48.4 | 122.10±110.6 | |
SWA, seawater adapted; FWA, freshwater adapted.
Values are means ± s.d.; N=40 for both adaptation states.
Parameters were similar for SWA and FWA neurons, but burst activity in FWA cells exhibited greater variability.