Saccade
also: eye jump
A saccade is the rapid, ballistic jump the eye makes between points of fixation. Vision is effectively suppressed during a saccade, so people only take in information at the fixation points a saliency model predicts — not on the path between them.
Human reading and scanning is not a smooth glide; it is a series of stops (fixations) connected by fast jumps (saccades) that last 20-40 milliseconds. You are functionally blind during each jump, which is why the location of fixations, not the trajectory, determines what a visitor actually perceives.
For a landing page this matters because attention is spent, not spread. If the first few fixations land on a stock photo instead of your headline, the message never registers. Predicting where those fixations concentrate is exactly what an attention heatmap does.
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