Germany

Already several seconds before we consciously make a decision its outcome can be predicted from unconscious activity in the brain. This is shown by a study of scientists from the Max Planck Institute for Human Cognitive and Brain Sciences in Leipzig, in collaboration with the Charité University Hospital and the Bernstein Center for Computational Neuroscience in Berlin. The researchers from the group of Professor John-Dylan Haynes used a brain scanner to investigate what happens in the human brain just before a decision is made. “Many processes in the brain occur automatically and without involvement of our consciousness. This prevents our mind from being overloaded by simple routine tasks. But when it comes to decisions we tend to assume they are made by our conscious mind. This is questioned by our current findings.” The study by Haynes and his colleagues Chun Siong Soon, Marcel Brass and Hans-Jochen Heinze will be published in the May issue of Nature Neuroscience and will available online on Sunday April 13th at 1pm EST (Embargo date).

In the study participants could freely decide if they wanted to press a button with their left or right hand. They were free to make this decision whenever they wanted, but had to remember at which time they felt they had made up their mind. The aim of the experiment was to find out what happens in the brain in the period just before person felt the decision was made. The researchers found that it was possible to predict from brain signals which option participants would take already seven seconds before they consciously made their decision. Normally researchers look what happens when the decision is made, but not what happens several seconds before. The fact that decisions can be predicted so long before they are made is a striking finding.

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