-Why do we need to move our eyes across a scene?
1 Most notably, the high spatial resolution is confined to a small fraction of the retina, the fovea. This makes sense, as implementing the foveal resolution abilities across the whole retina would not only have been very difficult, but the resulting flood of information reaching the brain would have been impossible
to accommodate in a reasonably sized skull.
-Would it not be easier if we could see the whole scene in front of us at once?
2 No, evolution has created a retinal periphery that covers a large portion of the visual environment and can monitor it for high contrast, low spatial frequency, fast changing or otherwise salient events. Once such events have been identified, the organism can either reflexively or voluntarily foveate them for a detailed analysis. For this purpose, a dedicated motor system has been developed. But it is activated only when aworthwhile target for an eye movement has been identified.
-What does FEF mean? And what is its role in vision?
3. FEF stands for the frontal eye Field, it is an area in the frontal cortex involved in the
generation of motor commands for pointing the eyes, and therefore directing the foveas, toward desired target locations FEF plays a central role in directing spatial attention, this process is directly linked to the generation of eye movement commands.
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