Visual masking is a psychophysical method commonly used to study visual information processing. Visual masking can be used to study the time course of visual information processing, but one of the limitations of this method is its inability to separate perceptual level processing from decision level processing. This study demonstrates that perceptual level processing can be separated from decision level processing by using a series of alternative forced choice visual masking tasks. Priming of perceptual level information is demonstrated. This priming can not be explained by existing feed forward visual information processing theories, but can be explained by the objects substitution model (Di Lollo et. al., 2000).
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