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The average area under the ROC curve is 0.6803, which means the saliency measures at fixations are significantly higher than the saliency measures at shuffled fixations.
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Since human fixations are also center biased, incorrect high saliency might be measured at the fixation points.
These variables and the eye movement measures (spread of fixations, mean fixation duration) were compared between groups and routes.
The KL divergence between the histogram of visual saliency sampled at fixations and the histogram of visual saliency sampled at random locations is another measure for evaluating models of visual saliency.
Eye position effects were measured with the stimulus at fixation, but with the eyes at different gaze angles.
The modified CA 6000 spinal motion apparatus with a new skin fixation system was used by three operators for the test-retest spine measurements (3 days apart), and to obtain measures at one session of spinal position.
Rather than comparing the saliency measures at attended locations in the current scene to the saliency measures at unattended locations in the same scene, we compared the saliency measures at the attended locations to the saliency measures in that scene at the locations that are attended in different scenes in the dataset, called shuffled fixations.
Individual differences in within-fixation variability of the POR and the resulting variation in fixation thresholds across tasks, stimuli, and individuals can be expected to influence the results, especially if one is interested in these measures at the individual level such as in correlational studies and experiments.
If a model of visual saliency predicts human gaze significantly better than chance, the saliency measure computed at human fixations should be higher than that computed at random locations, leading to a high KL divergence between the two histograms.
In all tasks, visual stimuli were presented either at fixation or 5 degrees below fixation.
Again, the stimuli were presented at fixation and 5 degrees below fixation.
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