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Comparison of mean thalamic glutamate extracellular concentrations obtained at different intensities of current-controlled (n=7) versus voltage-controlled stimulation (n=5) with fixed frequency and pulse width (100 Hz and 100 μsec, respectively).
| Current (mA) | 0.1 | 0.2 | 0.3 | 0.5 | 0.9 | 1.3 |
| Concentration (μM) | 7±3 | 22±8 | 38±13 | 71±25 | 123±42 | 146±50 |
| Voltage (V) | 10 | 20 | 30 | 50 | 70 | 90 |
| Concentration (μM) | 0.6±0.3 | 0.8±0.9 | 2.9±2.2 | 7.1±2 | 19.9±4.5 | 40.7±19.8 |
