Will LLM's Trigger a Catastrophic Loss in Critical Thinking Skills?

When you stop practicing a complex thinking skill—such as speaking a second language, playing an instrument, or solving advanced mathematics—your brain actively dismantles the neural pathways supporting that skill through a neuroplastic mechanism known as synaptic pruning.

The brain operates on a strict metabolic economy. Maintaining dense neural networks for complex cognitive abilities requires significant energy. When a skill goes unused, the lack of electrical firing signals the brain's immune cells (microglia) to systematically tag, ingest, and erase those specific synaptic connections (Rodrigo Carrillo-Marquez & Damian Carrillo-Ruiz, 2022).

Three Clinical Research Perspectives on Cognitive Erasure

The Sweet Spot: When Children’s Developing Abilities, Brains, and Knowledge Make Them Better Learners Than Adults (Gualtieri & Finn, 2022)

  • Human infants possess the initial neural capacity to recognize phonetic sounds from all languages.
  • Because they only receive auditory input from their native language, the pathways for processing foreign languages are left unstimulated.
  • This triggers "perceptual narrowing," completely erasing unused phonetic networks and destroying the ability to intuitively process those forgotten foreign language sounds.

Neurophysiology Involved in Neuroplasticity: Mechanisms of Forgetting (Rodrigo Carrillo-Marquez & Damian Carrillo-Ruiz, 2022)

  • The loss of complex procedural skills is an active, targeted biological process rather than passive decay.
  • When skills are no longer utilized, specific complement proteins tag the unused synapses, and the nervous system actively prunes them.
  • This active erasure frees up neurological resources, prevents the saturation of neural circuits, and optimizes the brain for the individual's current daily demands.

Neural evidence of deprioritizing to-be-forgotten information in visual working memory (Moen et al., 2024)

  • When the brain determines that specific cognitive information is no longer needed, the prefrontal cortex actively downregulates the retention of that data.
  • Functional MRI scans reveal that the brain intentionally shifts its firing patterns to drop the unused information.
  • This demonstrates that forgetting is a highly active mechanism utilized to clear visual working memory and minimize cognitive load.

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