Table 1.
Model Parameters
| Figure Panel | Stimulus | Attention Field | Baseline | |||
|---|---|---|---|---|---|---|
| Size | Size | Tuning Width (Deg) | Peak | Mod | Unmod | |
| 1 | 3 | 30 | – | 2 | ||
| 2A | 3 | 30 | – | 2 | ||
| 2B | 5 | 3 | – | 2 | ||
| 3C | 5 | 30 | – | 2 | X | X |
| 3F | 7 | 7 | – | 2 | X | |
| 4C | 5 | 5 | 20 | 5 | ||
| 4E | 5 | 5 | 20 | 5 | ||
| 5C | 10 | 10 | – | 2 | ||
| 6C | 10 | 30 | 60* | 2 | ||
| 7C | 5 | 5 | 45* | 5 | ||
Stimuli and attention fields varied across simulations, as listed in the table. Spatial sizes are in arbitrary units; only the relative values are meaningful For simulations with two or more stimuli, all had the same size. For all simulations, the size of the stimulation field was 5 and the size of the suppressive field was 20. Orientation and direction tuning curves were Gaussian functions; tuning widths are listed in degrees corresponding to the standard deviation of the Gaussian. For simulations of experiments in V4, involving oriented grating stimuli, the orientation tuning width of the stimulation field was 30° and the tuning width of the suppressive field was 180°. For simulations of experiments in MT/MST involving moving stimuli, these values were doubled to cover 360° of motion directions. A dash (−) for the attention field tuning width means that all orientations or directions were attended equally. An asterisk (*) for Figures 6C and 7C means that the attention field tuning width was as listed when attending the moving stimuli, but was unselective (all directions attended equally) when attention was directed to the fixation point. Baseline activity added to the stimulus drive was modulated by attention (marked by X under “Mod”). Baseline activity added after normalization was not modulated by attention (marked by X under “Unmod”).