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The stimuli were presented only after verifying subjects' fixation via the eye-tracker.
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In the dataset, 20 subjects' fixations are recorded for each image.
Each of the 4 sessions consisted of 20 blocks of 10 trials, interspersed with periods of rest (12 s), in which subjects fixated on a fixation cross.
Particularly, for each image, we construct a sequence of fixation maps by convolving subject fixations with a fovea-sized two-dimensional Gaussian kernel (σ = 1°, i.e. 30 pixels).
During the baseline period, subjects maintained fixation at the fixation cross, which was displayed on the screen throughout each of the four functional runs.
Subjects maintained fixation well during Experiment 2a and 2b, with breaks in fixation occurring on fewer than 1% of the trials on average for all subjects (maximum across subjects 1.7%).
For baseline trials, stabilometric activity was recorded while the subject fixated on the fixation point without visual stimulation).
Subjects maintained fixation at a central point (0.39 deg diameter) throughout the entire experiment.
The high degree of consistency between the tasks provides a validation of the underlying method and confirms that subjects maintained fixation during the active tasks.
The first 5 images of each fMRI time series, during which subjects maintained fixation, were removed to allow the hemodynamics to achieve a steady state and to minimize transient effects of magnetic saturation.
Subjects maintained fixation well during all fMRI measurements.
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