Regions active following covert deployment of attention are modulated by the spatial locus of attention as well as whether subjects expect upcoming visual stimuli to be low or high contrast
| Preparatory activity modulated by: | |||
|---|---|---|---|
| Contrast | Cue direction | Contrast × cue direction | |
| Regions active after preparatory cue | |||
| Cingulate sulcus | |||
| Superior frontal gyrus (SMA) | * | ||
| Frontal eye field | + | *** | |
| Middle frontal gyrus | |||
| Inferior frontal sulcus | * | ** | |
| Anterior intraparietal sulcus | |||
| Posterior intraparietal sulcus | * | ||
| Superior temporal gyrus | |||
| Subdivisions of visual cortex | |||
| Stimulus V1–V4 (upper field) | * | * | |
| Stimulus V3A | * | * | |
| Lower field | * | ** | |
| Central field | ** | ||
The above table lists the results of a series of three-way regional ANOVAs [cued location, upcoming target contrast, time (six timepoints)] on the time course of the preparatory, prestimulus BOLD response. SMA, Supplementary motor area.
↵*p = 0.05;
↵**p = 0.01;
↵***p = 0.001; + p = 0.057 (marginal significance).