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For medium luminance levels, the visibility threshold is generally small.
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The averaged empirical data suggest that fixation probability is highest for medium-luminance patches (Fig. 3A).
However, the useful range of saturation decreases as we move away from medium luminance values.
Instead, the attentional response modulation was already large for low to medium luminance contrast stimuli, especially in the curve-tracing task where the responses of the majority of neurons were better described by the additive model.
A medium luminance filter which removes samples below 10% of the minimum luminance and above 90% of the maximum luminance improves the false-positive rate by 1.4% (compared to the baseline) and keeps the detection rate constant.
Patches with medium luminance are associated with a large variability in local contrast, but they tend to have higher contrast (Fig. 4A).
The negative quadratic coefficient in the luminance-only GLMM suggested that fixation probability is maximal for image patches with medium-luminance, and is considerably reduced for both very dark and very bright scene regions.
Balanced (clockwise/counterclockwise, in/out) phase-encoded polar angle (wedge) and eccentricity (ring) stimuli contained medium-luminance-contrast colored checkerboards, optical flow fields, and simultaneous monitor-for-upside-face-among-right-side-up and monitor-for-number-among-letters tasks to maintain continuous peripheral attention (eight 64 second cycles).
In human visual MTF for luminance, contrast sensitivity is high for medium spatial frequency and is suddenly low for high spatial frequency.
Our results suggest that even for medium size arrays, a difference of 1% can be found in the luminance of the small target due to changes in the background luminance.
It's plural for "medium".
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