In addition, to find out whether the change in perceived contrast was predominantly mediated by the peak or trough parts of the grating, experiments were done also with purely positive or negative contrast stimuli (increment or decrement bars).
Finally, there appeared to be a general trend that for a given step direction, attenuation was more persistent for the stimulus type which modulates to the same direction as the mean luminance, i.e., for the increment bars when presented with an upward luminance step and for the decrement bars when presented with a downward step.
Results of the experiments with either increment or decrement bars as contrast stimuli, i.e., with a single contrast polarity relative to the mean level, are shown in Figure 4. Regardless of contrast polarity, attenuation was always stronger and more persistent with the upward step (grey upward triangles) than with the downward step (black downward triangles).
We found that only the high-noise exposed workers high-noise exposedBAR and SVC during workersd off-duty periods compared withadhose decrementsep time.
In experiment 3, the stimuli were either gratings as in experiment 1 or bars of increment or decrement luminance with height of 1/8 deg and width of 1 deg (i.e., approximately the spatial dimensions of a central half cycle of the grating stimulus).
Luminance levels of the first bar were either incremented or decremented, where the second bar always had the same luminance level.
The effect was fairly similar for sinusoidal contrast gratings and for bars representing pure increment or decrement contrasts.
A further increment of 1% pt. in gross cycle efficiency can be achieved with the decrement of 5 K pinch temperature difference or 0.7 bar pressure loss in the recuperators.
Shadow bars indicate the expected plasticity increment and posterior decrement observed in Figures 2 and 3.
When the strum bar is pushed up or down, the menu item selected is either decremented or incremented, respectively, and the new selection is sent to the video board in the MENUS command.
Future studies with different protocols47 must be performed to characterise the performance decrement in futsal.
