Previewing distracters reduces their effective contrast.
In a visual search task, when half the distracters are presented earlier than the remainder ('previewed'), observers find the target item more efficiently than when all the items are presented together -- the preview benefit. We measured psychometric functions for contrast increments on Gabors that were presented as a valid preview for subsequent search, and when they were a non-predictive (dummy) preview. Sensitivity to contrast increments was lower (rightwards shift of the psychometric func...Expand abstract
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