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Benjamin Libet performed a serious of experiments often used as evidence against free will. Subjects asked to make spontaneous decisions showed brain activity prior to their conscious decision making, which was interpreted as the brain acting before conscious awareness.

Latest data indicate that Libet's interpretation was most likely incorrect. The brain activity recorded turns out to be random fluctuations that occur in any complex system. When brain activity is high, one is more likely to make a spontaneous decision. So Libet's "signal" was not the brain making a decision, but rather an indication that the brain was in a state where a decision was more likely.

In a study currently under review for publication, researchers repeated the Libet experiments but with modifications that controlled for random brain fluctuations. Now the brain activity associated with the decision occurred at the same time as conscious awareness of making the decision.

"An artificial-intelligence classifier allowed them to find at what point brain activity in the two conditions diverged. If Libet was right, that should have happened at 500 milliseconds before the movement. But the algorithm couldn’t tell any difference until about only 150 milliseconds before the movement, the time people reported making decisions in Libet’s original experiment."
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