Increasingly higher levels of information processing contribute to the highest level of visual perception, that of object recognition. An unconscious decision-making eventarising at the end of an unconscious inference process acts upon the already processed visual information resolving the ambiguity inherent to such information. In the case of multistable reversible patterns, the ambiguity is never resolved and the perception alternates among different interpretations of the visual information. The perception alternance model is used here to investigate the possibility to access into the decision-making module by means of mental activities applied in a downward direction. A will effort modifies the time patterning of the perception alternance. The will effect is higher if the decision-making mechanism is resetted also by the application of subliminal stimuli.
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