The present invention concerns methods and apparatus for detecting perturbations to previously established and known contextualizations practiced or exhibited by subjects when confronted by certain propositions about original items. The subjects are understood to be any sentient beings, e.g., human beings that use the known contextualizations modulo the propositions and also exhibit known measurable indications in response to these propositions. Measurable indications can take on the form of responses, actions, behaviors or any measurable aspects that can be collected from the subjects in response to the propositions. The perturbation to the contextualization that is adopted by the subjects is due to altering the original item to generate an altered item and placing the altered item at the center of the proposition that was previously apprehended by the subjects to be about the original item.
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