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Search for Unconscious Memory Gets Warmer

Search for Unconscious Memory Gets WarmerUniversity of California-Davis researchers have discovered that a small area deep in the brain called the perirhinal cortex is critical for forming unconscious conceptual memories.

The perirhinal cortex was thought to be involved, like the neighboring hippocampus, in “declarative” or conscious memories, but the new results show that the picture is more complex, said lead author Wei-chun Wang, a graduate student at the university.

We’re all familiar with memories that arise from the unconscious mind. Imagine looking at a beach scene, said Wang. A little later, someone mentions surfing, and the beach scene pops back into your head.

Declarative memories, in contrast, are those where we recall being on that beach and watching that surf competition: “I remember being there.”

Damage to the hippocampus affects such declarative “I remember” memories, but not conceptual memories, Wang said. Neuroscientists had previously thought the same was true for the perirhinal cortex, which is located immediately next to the hippocampus.

Wang and colleagues carried out memory tests on people diagnosed with amnesia, who had known damage to the perirhinal cortex or other brain areas. They also carried out functional magnetic resonance imaging (fMRI) scans of healthy volunteers while they performed memory tests.

In a typical test, they gave the subjects a long list of words, such as chair, table or spoon, and asked them to think about how pleasant they were.

Later, they asked the subjects to think up words in different categories, such as “furniture.”

Amnesiacs with damage to the perirhinal cortex performed poorly on the tests, while the same brain area lit up in fMRI scans of the healthy control subjects.

The study aids in understanding how memories are assembled in the brain and how different types of brain damage might impair memory, Wang said.

For example, Alzheimer’s disease often attacks the hippocampus and perirhinal cortex before other brain areas.

The results were published in the journal Neuron.

Source: University of California – Davis

Search for Unconscious Memory Gets Warmer

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). Search for Unconscious Memory Gets Warmer. Psych Central. Retrieved on September 21, 2018, from https://psychcentral.com/news/2010/12/16/search-for-unconscious-memory-gets-warmer/21866.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.