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Evolutionary Link for Basic Learning

A new study 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.

Researchers from the Swedish medical university Karolinska Institutet investigated the limbic striatum, one of the evolutionarily oldest parts of the brain. They explored how individuals learn movements (consciously and unconsciously) through repetition.

Many of the mundane skills that we apply every day, such as buttoning 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: the implicit and explicit systems.

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.

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

In the present study, published in PNAS, the journal of the American Academy of Sciences, researchers have examined both the implicit and explicit learning of motor sequences in relation to the number of dopamine D2 receptors in the basal ganglia.

While they found a correlation between D2 receptor density and both forms of learning, they also noted that the evolutionarily oldest part of the basal ganglia — the limbic striatum — was involved only in implicit learning.

“In other words, we probably have certain fundamental learning systems in common not only with rats, mice and other mammals, but also with the most primitive vertebrates, which also have a limbic striatum,” says Dr UllĂ©n.

In the future, a better understanding of how these learning systems work can be of use in developing new treatments for diseases such as Parkinson’s and Huntington’s, diseases which are characterized by disorders of basal ganglia function and impaired motor skills.

Source: Karolinska Institutet

Evolutionary Link for Basic Learning

Rick Nauert PhD

Rick Nauert, PhDDr. Rick Nauert has over 25 years experience in clinical, administrative and academic healthcare. He is currently an associate professor for Rocky Mountain University of Health Professionals doctoral program in health promotion and wellness. Dr. Nauert began his career as a clinical physical therapist and served as a regional manager for a publicly traded multidisciplinary rehabilitation agency for 12 years. He has masters degrees in health-fitness management and healthcare administration and a doctoral degree from The University of Texas at Austin focused on health care informatics, health administration, health education and health policy. His research efforts included the area of telehealth with a specialty in disease management.

APA Reference
Nauert PhD, R. (2015). Evolutionary Link for Basic Learning. Psych Central. Retrieved on September 25, 2018, from https://psychcentral.com/news/2010/04/07/evolutionary-link-for-basic-learning/12653.html

 

Scientifically Reviewed
Last updated: 6 Oct 2015
Last reviewed: By John M. Grohol, Psy.D. on 6 Oct 2015
Published on PsychCentral.com. All rights reserved.