Table 1.
Glossary of model parameters, and their values to two significant figures
| Symbol | Parameter | Value | Unit |
|---|---|---|---|
| c | Contrast | 0.3, unless otherwise stated | None |
| ϕ | Spatial phase | Variable | radians |
| gs | Contrast sensitivity of center mechanism | 62 | mV/contrast-unit |
| gc | Gain of geniculocortical convergence | 3.5 | None |
| ge | Gain of inhibitory-excitatory convergence | 2.2 | None |
| grect | Rectifier gain | 7.2 | Hz/mV |
| j | Index of subcortical channel | 1, 2, …, 3281 | None |
| k | Index of cortical neuron | 1, 2, …, 6561 | None |
| nj | Sign of subcortical channel j |  |
None |
| ω | Temporal frequency | Variable | radians/s |
| ωstim | Stimulus temporal frequency | 2π × 2 | radians/s |
| p | Generator potential | Variable | mV |
| ps | Static subcortical depolarization | 1.9 | mV |
| rs | Radius of center mechanism | 0.4 | deg |
| rc | Radius of geniculocortical convergence | 0.95 | deg |
| re | Radius of inhibitory-excitatory convergence | 0.95 | deg |
| ψ | Spatial frequency | Variable | radians/deg |
| ψstim | Stimulus spatial frequency | 2π × 0.5 | radians/deg |
| t | Time | Variable | s |
| τ | Time constant, Stages 1, 5, 7 | 0.01 | s |
| τinh | Time constant, Stage 6 | 0.1 | s |
| τj | Time constant of channel j, Stages 2, 3, 4 |  |
s |
| θ | Motion direction of stimulus | Variable | radians |
| wjk | Weight of synapse from subcortical channel j to cortical neuron k | 0-2 | None |
| x | Position in visual field | Variable | deg |
| xj | Position of subcortical channel j | Variable | deg |
| xk | Position of cortical neuron k | Variable | deg |
| z | Index of processing stage | 1, 2, …, 7 | None |
