Unconscious Learning Uses Old Parts of the Brain

ScienceDaily (Apr. 7, 2010)

A new study from the Swedish medical university Karolinska Institutet provides evidence that basic human learning systems use areas of the brain that also exist in the most primitive vertebrates, such as certain fish, reptiles and amphibians. The study involved an investigation into the limbic striatum, one of the evolutionarily oldest parts of the brain, and the ability to learn movements, consciously and unconsciously, through repetition.

"Our results strongly substantiate the theories that say that the implicit, by which I mean non-conscious, learning systems of the brain are simpler and evolutionarily older," says Associate Professor Fredrik Ullén from Karolinska Institutet and the Stockholm Brain Institute.

Many of the mundane skills that we apply every day, such as buttoning up a shirt or playing an instrument, comprise a sequence of discrete movements that must be carried out in the correct order. Scientists have long known that there are two learning systems for such patterns of movement; with the implicit system, we learn without being aware of the fact and without conscious training, such as through simple repetition. The explicit system, on the other hand, we use when we consciously train and are aware of what we are learning.

A brain structure that is involved in learning and motor control is the basal ganglia, which lie deep in the cerebral hemispheres. Dopamine, a substance used in the transmission of signals between neurons, is important for learning and the plasticity of the basal ganglia.



Unconscious Learning Uses Old Parts of the Brain