AI Article Synopsis
- Visual metacontrast masking can occur in two ways: type-A, where shorter delays lead to stronger masking, and type-B, where longer delays enhance the effect.
- Findings reveal that individual differences among observers influence which type of masking appears under the same stimulus conditions.
- Type-A masking is more pronounced when the shapes of the target and mask are incongruent, significantly impacting how well the target is identified at short delays.
Article Abstract
Visual metacontrast masking may depend on the time intervals between target and mask in two qualitatively different ways: in type-A masking the smaller the mask delay from target the stronger the masking while in type-B masking maximal masking effect is obtained with a larger temporal delay of the mask. Variability in the qualitative apperance of masking functions has been explained by variability in stimuli parameters and tasks. Recent research on metacontrast masking has surprisingly shown that both of these types of functions can be found with an identical range of stimulation parameters depending on individual differences between observers. Here we show that obtaining clear-cut type-A masking depends on whether target and mask shapes are congruent or incongruent and whether observers use the cues available due to the congruence factor. Conspicuously expressed type-A masking is selectively associated with incongruent target-mask pairings. In the latter conditions target identification level significantly drops with the shortest target-to-mask delays.
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| http://dx.doi.org/10.1111/j.1467-9450.2011.00904.x | DOI Listing |
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