Genetic Flaw in the Brain Explains Why People Cling to Outdated Ideas

Why do some people stubbornly cling to ideas that have long ceased to be effective, even when reality is literally hitting them in the face? It appears that the issue is not solely due to obstinacy or poor character, but rather a specific technical 'base' within our brains. Neurobiologists at the Massachusetts Institute of Technology (MIT) have discovered a genetic flaw that effectively traps thinking in the past experiences. This finding explains cognitive bottlenecks associated with schizophrenia and illustrates how our internal computer updates (or fails to update) its beliefs, as reported by SciTechDaily.

The main suspect in this scenario is the grin2a gene. This gene is responsible for constructing NMDA receptors—essential transmitters that allow neurons to 'communicate' properly with each other and learn new information. When a malfunction occurs in this gene, the crucial connection between the mediodorsal thalamus (the center for processing signals) and the prefrontal cortex (where decisions are made) begins to 'lag.' This results in significant problems in cognitive functioning.

To observe this glitch in action, scientists conducted a rigorous test involving mice. The rodents had to choose between two levers: one that dispensed a food crumb instantly, and another that promised a feast but required increasingly more presses each time. Healthy animals quickly 'caught on': as soon as the larger reward became too costly in terms of effort, they smoothly switched to the simpler option. This demonstrated their ability to adapt to changes.

In contrast, mice with the grin2a mutation simply 'froze.' They either chaotically pressed all levers indiscriminately or continued pressing the lever that had long ceased to be beneficial. They physically could not comprehend that the rules of the game had changed. This phenomenon confirms that erroneous beliefs can be so strong that they hinder the ability to make new decisions.

Researcher Tingting Zhou explains this through the conflict between 'expectations' and 'reality.' Normally, the brain constantly compares what we know about the world (our experiences) with what we see in the present. In cognitive disorders, particularly schizophrenia, old data attain the status of 'absolute truth.' The brain simply ignores new signals from the sensory organs, preferring the outdated internal picture. This leads to an inability to respond adequately to changes in the surrounding world.

However, the most intriguing development occurred at the end of the experiment. The scientists decided to test whether it was possible to 'reprogram' such a brain. Using optogenetics—a method where neurons are activated by flashes of light—they artificially stimulated the same thalamus in the 'glitched' mice. The results were astonishing: once the connection was restored, the mutant mice began making decisions as quickly and appropriately as their healthy counterparts. In essence, the researchers manually 'fixed' the ability to adapt, opening new horizons for treating cognitive disorders.

While the mutation of this specific gene is not present in every patient, the neural pathway identified is a common route for many disorders. The MIT team is now searching for ways to target this chain using conventional medications rather than lasers. If successful, this could provide a key to treating conditions where individuals are simply unable to break free from the confines of their own illusions because their brains refuse to update their 'software.' This could mark a significant step forward in understanding and treating mental disorders.

Legal Information: This article contains general reference information and should not be considered a substitute for medical advice. NV is not responsible for any diagnosis made by the reader based on the materials on the site. NV also bears no responsibility for the content of other internet resources linked to in this article. If you are concerned about your health, please consult a physician.