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The periodic real-time task mode is a special case of the unimodal arrival model, where the value a i equals to 1.
These were assumed to be constant across the task mode.
To allow the amount of noise to vary with the task mode, each N was multiplied by Aa, Am, and Aext, which were assumed to be 1.0 in the dual-task mode but a variable in the single-task mode.
The measurements were separately done for each target temporal frequency (0 and 20 Hz) and for each task mode.
These results suggest that the effect of task mode is larger for low temporal frequencies than for high temporal frequency.
However, we found that these displays were not strong enough to confine observers' attentional resource throughout the target presentation, and found no significant effect of the task mode.
Similar(49)
The middle panel shows the ratio in the contrast sensitivity between the two task modes; a lower value indicates a larger sensitivity reduction in the dual-task mode.
The results showed that changes in the slope across task modes were partially replaced by those in the asymptote level.
These results are not consistent with the notion that fixational eye movement alone explains variations in the contrast sensitivity between the two task modes.
In both task modes, the luminance contrast of the grating was decreased by 0.1 log unit after a correct response and increased by the same amount after an incorrect response.
The results showed that the average power spectrum across observers did not significantly differ between task modes at any temporal frequency from 1 to 100 Hz (t-test in log scale, p>0.13).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com