Covert Attention is the form of attentional processing accounts for this difficulty.
Eye movements are preceded by covert attention, which during fixation can be directed at several places at once. Effectively monitoring the visual scene and directing future eye movements require covert visual attention. Numerous psychophysical, physiological, and imaging studies have shown that overt and covert visual attention are closely related. Humans naturally prefer to move their gaze explicitly with changes in attention in the event of naturalistic circumstances, unless restrained differently, even though mechanisms of covert and overt attention are fascinating to investigate. Today's eye tracker technology makes it simple to record overt attention and records gaze information, which also explains why it has been extensively explored. This is also one of the explanations for why overt attention is the main focus of work on computational modeling of visual attention.
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