Ciekawostka: The common idea that only 10% of the brain is used it not true as it is impossible to determine the actual percentage be

Evidence: 47 • authority: 92

How Long Is the Brain Perfusable After Global Ischemia? A Systematic Review.. Background Global cerebral ischemia initiates a cascade of pathophysiological changes that progressively impair subsequent perfusion of brain tissue. Some authors have proposed that adequate cerebral perfusion becomes impossible after approximately 10-30 min of global ischemia. However, the extant evidence base for this threshold and its variations across studies has not yet been systematically examined. Objective To synthesize the literature on post-ischemic cerebral perfusion success as a function of ischemia duration. Methods We searched PubMed (11 February 2026) for studies of global cerebral ischemia in anima…

Evidence: 29 • authority: 92

Perineuronal nets preferentially surround parvalbumin interneurons in the prelimbic cortex: A rat and mouse comparison.. Recent work has shown the importance of perineuronal nets (PNNs) in modulating neuronal function and plasticity. Functional studies increasingly manipulate PNNs to probe their role in learning and memory, yet interpreting these manipulations requires knowing which cell types PNNs surround, information that remains incomplete for several brain regions. This study focuses on the prelimbic cortex to determine the percentage of specific interneurons and pyramidal cells that are surrounded by PNNs in male rats and mice. We used immunohistochemistry to assess prelimbic cortex c…

Evidence: 29 • authority: 72

The ten-percent-of-the-brain myth states that humans generally use only one-tenth (or some other small fraction) of their brains. It has been misattributed to many famous scientists and historical figures, notably Albert Einstein. By extrapolation, it is suggested that a person may 'harness' or 'unlock' this unused potential and increase their intelligence. Changes in grey and white matter following new experiences and learning have been shown, but it has not yet been proven what the changes are. The popular notion that large parts of the brain remain unused, and could subsequently be "activated", rests in folklore and not science. Though specific mechanisms regarding brain function remain…

Evidence: 21 • authority: 80

Appendix C: Common Acronyms Used in Brain Research

Evidence: 21 • authority: 92

Evolutionary lags in the primate brain size/body size relationship revisited.. The original brain lag hypothesis proposed that primate brain evolution depended on spare energy derivative of savings of scale enabled by first increasing body size. However, in a seminal analysis, Deaner & Nunn concluded that there was no evidence for a brain lag. I revisit their analysis and show that using statistically more appropriate analyses and updated data yields a significant brain lag effect. However, contrary to the original brain lag hypothesis, the brain/body ratio does not converge back on the allometric regression line, but continues to evolve beyond it. Increases in brain size are correlated wit…

Evidence: — • authority: 35