How Dreaming, Neural Rivalries, and AI Shape Cognitive Health

Dreaming defends the visual territory of the brain from takeover by other senses during the darkness of sleep. When sighted individuals are blindfolded, the visual cortex begins to show signs of takeover in as little as 60 minutes, prompting the midbrain to blast random activity into the visual system every 90 minutes. This periodic burst keeps the visual cortex active and prevents atrophy. Across species, REM sleep correlates with brain plasticity; humans, who have high plasticity, also spend a large proportion of infant sleep in dream sleep (about 50 %). Even blind animals such as the blind mole rat retain dream circuitry, indicating an ancient evolutionary mechanism.

The “Team of Rivals” Brain Model

The brain operates like a neural parliament, a collection of competing networks rather than a single, unified self. Conflicting desires—such as the urge to eat a cookie versus the goal of dieting—represent different “voices” or “political parties” within this parliament. The network that wins the internal vote determines behavior. “Ulysses contracts” are practical strategies that constrain future actions by removing temptations now, for example clearing alcohol from the house to prevent drinking later.

Brain Plasticity and Aging

Raw connectivity in the brain peaks at age two, after which pruning refines the network to specialize for the environment. Plasticity, the brain’s ability to hold shapes like a malleable material, diminishes with age because the brain has already built a successful internal model of the world and requires fewer changes. Nevertheless, the brain continues to adapt throughout life, guided by experience and challenge.

The Role of Challenge and Cognitive Reserve

Cognitive reserve builds when the brain constantly creates new pathways through novelty and difficulty. Retirement without mental engagement can lead to cognitive decline because the brain stops forging fresh connections. When a skill becomes easy—such as solving Sudoku repeatedly—it should be abandoned for a more demanding activity to force the formation of new pathways. Social interaction is especially taxing for the brain; nothing is as hard for the brain as other people, making it vital for cognitive health. The anterior mid‑cingulate cortex, linked to willpower, is larger in individuals who regularly perform difficult tasks they do not want to do.

AI, Education, and Human Potential

AI functions as a “motorcycle for the mind,” accelerating access to knowledge and enabling faster mental travel. Repetitive administrative tasks constitute “vicious friction” that should be offloaded to AI, while “virtuous friction” such as deep thinking and strategic planning should be embraced to foster growth. The current generation may become smarter because the internet and AI provide an unprecedented “intellectual diet.”

Creativity and Selection

AI excels at remixing existing concepts, producing massive creative output, but it lacks the human capacity for selection—choosing which output is most appealing or meaningful. Humans remain novelty seekers, preferring a balance between familiarity and newness.

Individual Cognitive Differences

Visualization ability spans a spectrum: hyperphantasia describes vivid mental imagery, while aphantasia denotes an absence of visual imagery. These differences do not limit overall capacity; people employ motoric, auditory, or conceptual strategies to achieve comparable results. Synesthesia, experienced by at least 3 % of the population, blends senses and represents an alternative perceptual reality rather than a disorder.

Societal Dynamics

Dehumanization occurs when the brain’s social circuitry is dialed down, causing individuals to view others as objects rather than persons. Strengthening cross‑cutting interests with perceived out‑groups can restore empathy. Social media algorithms prioritize retention through dopamine‑triggering “slot machine” mechanics, reinforcing echo chambers. A market opportunity exists for platforms that prioritize meaningful human connection over outrage‑driven engagement, with a predicted shift toward such models by 2026.