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Comparison of experimentally obtained parameters in calibration solution with numerical cell constants_ The capacitances that correspond to Rcal were calculated from the experimental cell constants with equation (2)_
| Electrode | Measurements | Corresponding capacitance | Numerical results | ||
|---|---|---|---|---|---|
| Rcal ± SEM [Ω] | σ [Sm-1] | γ ± SEM [μm] | Ccal ± SEM [pF] | γ [μm] | |
| bipolar | 17,544 ± 1,933 | 0.1307 | 460 ± 65 | 0.33 ± 0.05 | 418 |
| unipolar | 7,631 ± 78 | 0.1307 | 1049 ± 13 | 0.74 ± 0.01 | 989 |
Experimental in vivo conditions
| Bipolar electrode | Unipolar electrode | |
|---|---|---|
| Animal-group size | 4 | 9 |
| Counter electrode | Intracerebral shorter electrode | Subcutaneous gold wire (Figure 4) |
| Stimulating signal | 60 μs rectangular constant current (200 μA negative) pulses of 130 Hz repetition rate; capacitive compensation current between the pulses | |