Science Of The Day
Out of context: Reply #244
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From the book Biocentrism by Robert Lanza
In reality, recent experiments show conclusively that the brain’s electrochemical connections, its neural impulses traveling at 240 miles per hour, cause decisions to be made faster than we are even aware of them. In other words, the brain and mind, too, operate all by itself, without any need for external meddling by our thoughts, which also incidentally occur by themselves. So control, too, is largely an illusion. As Einstein put it, “We can will ourselves to act, but we cannot will ourselves to will.”
The most cited experiment in this field was conducted a quarter-century ago. Researcher Benjamin Libet asked subjects to choose a random moment to perform a hand motion while hooked up to an electroencephalograph (EEG) monitor in which the so-called “readiness potential” of the brain was being monitored. Naturally, electrical signals always precede actual physical actions, but Libet wanted to know whether they also preceded a subject’s subjective feeling of intention to act. In short, is there some subjective “self ” who consciously decides things, thereby setting in motion the brain’s electrical activities that ultimately lead to the action? Or is it the other way ’round? Subjects were therefore asked to note the position of a clock’s second hand when they first felt the initial intention to move their hand.
Libet’s findings were consistent, and perhaps not surprising: unconscious, unfelt, brain electrical activity occurred a full half second before there was any conscious sense of decision-making by the subject. More recent experiments by Libet, announced in 2008, analyzing separate, higher-order brain functions, have allowed his research team to predict up to ten seconds in advance which hand a subject is about to decide to raise. Ten seconds is nearly an eternity when it comes to cognitive decisions, and yet a person’s eventual decision could be seen on brain scans that long before the subject was even remotely aware of having made any decision. This and other experiments prove that the brain makes its own decisions on a subconscious level, and people only later feel that “they” have performed a conscious decision. It means that we go through life thinking that, unlike the blessedly autonomous operations of the heart and kidneys, a lever-pulling “me” is in charge of the brain’s workings. Libet concluded that the sense of personal free will arises solely from a habitual retrospective perspective of the ongoing flow of brain events.