Abstract
Duration thresholds of visual targets varying in brightness contrast were measured under backward masking and nonmasking conditions. As expected, thresholds varied as a function of target contrast in the nonmasking condition; thresholds were elevated for all targets in the masking condition. These results bear on the interpretation of a previously reported finding that targets with increasing numbers of internal contours were both increasingly hard to detect and hard to mask. The attribution of that finding to mechanisms underlying contour interaction continues to be worthy of consideration: in particular, the previous results do not reflect a general relation between target detectability and target maskability.
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