There are $8\mathrm{cycle}∕\mathrm{deg}$ ripples or oscillations in performance as a function of location near Mach bands in experiments measuring Mach bands’ masking effects on random polarity signal bars. The oscillations with increments are $180°$ out of phase with those for decrements. The oscillations, much larger than the measurement error, appear to relate to the weighting function of the spatial-frequency-tuned channel detecting the broadband signals. The ripples disappear with step maskers and become much smaller at durations below $25\mathrm{ms}$ , implying either that the site of masking has changed or that the weighting function and hence spatial-frequency tuning is slow to develop.

© 2007 Optical Society of America

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