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The researchers don't yet know how or why choice blindness occurs, but they think it gets to the very heart of how we make decisions. Some of the most popular theories about decision-making assume that people will notice when their choices and the outcomes of those choices don't line up.

"But as our experiment shows, this is not always the case," Hall told LiveScience.

"Therefore the concept of 'intention' needs to be reevaluated and scrutinized more closely."

Choice blindness experiments may also provide a way to study subjectivity and introspection, topics once considered by many scientists to be extremely difficult or even impossible to evaluate scientifically.

"If someone insists on knowing their own mind, it is very difficult to progress beyond this point," Hall said. "[But] by using choice blindness we can create a very particular €€and very strange€€situation in which we actually can say that someone is wrong despite the fact that they might vehemently claim to know their own mind."

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