Table 2.
Parameters obtained by fitting the calcium-based model to visual cortex plasticity data of regular and jittered spike-pairs (Sjöström et al., 2001)a
| Parameter | Unit | Linear calcium dynamics | Nonlinear calcium dynamics |
|---|---|---|---|
| τCa | ms | 22.27212 | 18.93044 |
| Cpre | 0.84410 | 0.86467 | |
| Cpost | 1.62138 | 2.30815 | |
| θd | 1 | 1 | |
| θp | 2.009289 | 4.99780 | |
| γd | 137.7586 | 111.82515 | |
| γp | 597.08922 | 894.23695 | |
| τcb | s | 520.76129 | 707.02258 |
| D | ms | 9.53709 | 10 |
| n | 1 | 2 |
a Calcium amplitudes and thresholds are scaled by θd without loss of generality. The nonlinearity factors are 1 for the linear implementation (i.e., linear summation of presynaptically and postsynaptically evoked calcium transients) and 2 for the nonlinear implementation (Nevian and Sakmann, 2006).