Benjamin Libet found that actions we believe to be volitional, intentional acts arise in the brain 500ms prior to the sensation of "deciding" to do them.
I'm not sure why you're being downvoted, but it may be that Libet's findings have been brought into question.
"people’s subjective experience of a decision—what Libet’s study seemed to suggest was just an illusion—appeared to match the actual moment their brains showed them making a decision."[1]
In short, Libet's findings may have been an experimental error related to noisy brain activity.
