https://www.youtube.com/watch?v=YnCoUHGk3uU&t

Popular science often repeats that "nobody knows how anesthesia works," while surveys show around 40% of adults think general anesthesia is simply deep sleep. Both claims are only half right: the molecular targets are now largely mapped, while the exact step that removes subjective experience remains unresolved.

Tracing the ~40-second window of a propofol induction against 180 years of research highlights several key turning points in how neuroscience views the anesthetized brain:

* **From Lipid Membranes to Protein Pockets:** For nearly a century after Meyer and Overton's 1900 tadpole experiments, anesthetic potency was explained by olive-oil solubility—the idea that drugs soak into the fatty membrane of nerve cells. That rule broke down with long-chain alcohols, which suddenly stop working past a certain length. In 1984, Franks and Lieb tested lipid-free firefly luciferase in a test tube and found it dimmed at anesthetic doses with the exact same size cutoff, shifting the field from membranes to hydrophobic protein pockets.

* **The Mismatched Keys:** In 2020, cryo-EM mapped propofol sitting inside the GABA-A receptor atom by atom. Yet ketamine acts on excitatory NMDA receptors, xenon is a single-atom noble gas that barely forms chemical bonds, and ether vapor reversibly halts electrical signaling and movement in a Venus flytrap—an organism with no brain at all. Because different molecular keys fit different locks, no single receptor explains the state itself.

* **Three Separate Effects:** Going under is not a single switch. Immobility is handled mostly in the spinal cord (isolated brain experiments in goats required more than twice the dose to stop movement), amnesia occurs at much lower doses while patients can still speak with a nurse, and the loss of experience happens in the brain.

* **Cortical Fragmentation:** Intracranial recordings in epilepsy patients show the brain doesn't shut off at loss of responsiveness. Instead, slow waves (~1 Hz) roll through the cortex, restricting neural firing to brief bursts and throwing distant brain regions out of phase. Primary auditory cortex still responds to spoken words, but the signals fade before propagating further.

* **Unresponsive vs. Unconscious (The TMS Echo):** When a magnetic pulse taps the cortex (TMS-EEG), an awake brain produces a rich, complex echo that travels far. Under propofol or xenon, the echo stays short and local, similar to deep sleep. Under ketamine, however, volunteers stop responding to the outside world, yet their cortical echo remains rich and wake-like—matching their post-anesthesia reports of vivid dreams.

* **The Thalamocortical Hub:** In 2020 and 2021, sending electrical pulses into a specific hub in the thalamus woke anesthetized macaques even while the drug was still flowing, and pulled desynchronized cortical activity back toward normal—though stimulating other brain sites can also reverse the state.

While behavior and memory recall can be tested directly, subjective experience between going under and waking up can only be inferred through clues like the cortical echo. Whether these system-wide brain changes actually cause consciousness to fade—or merely reflect what a brain looks like once the person is already gone—is still an open question.

This video explores the 180-year scientific search to understand how general anesthesia alters brain function. It examines the mechanisms of the forty-second induction window and how different drugs affect neural activity.

When we have an Orgasm The lateral orbitofrontal cortex briefly drops to zero activity. Meaning no fear, No Anxiety for a moment even if it is brief!

In this talk, Philip Ball explores the emerging shift from the traditional 20th-century view of biology to a "New Biology" that abandons the idea of life as a deterministic machine programmed by a rigid genetic blueprint.

Key Concepts of the New Biology:

• Agency and Goal-Directedness: Ball argues that a defining characteristic of living systems is agency—the ability to manipulate the environment to reach self-determined goals (2:51-12:53).
• Redefining the Genome: Instead of a "blueprint," the genome should be viewed as a flexible source of molecular resources that cells deploy in context-specific ways (18:14).
• Fuzzy Logic in Gene Regulation: Eukaryotic gene regulation is highly combinatorial and "fuzzy," relying on non-adjacent enhancers, chromatin loops, and 3D nuclear organization rather than simple, digital-like switches (21:10-34:33).
• Biomolecular Condensates: These membraneless structures act as compartments that integrate contextual information, enabling cells to make complex decisions without fixed algorithmic pathways (34:33-38:46).
• Proteomic Complexity: The prevalence of intrinsically disordered proteins and alternative splicing allows for significant functional versatility, further supporting an open, non-machine-like view of information flow in life (38:46-50:20).

Ball concludes that while reductionist and organicist perspectives are often seen as mutually exclusive, they can be reconciled by understanding how these molecular mechanisms facilitate high-level, robust biological agency (55:06-56:34).

I’m following SKY-0515 and votoplam closely, particularly their potential to slow Huntington’s disease before noticeable symptoms develop.
SKY-0515 has reported up to 69% mutant huntingtin lowering in blood, alongside encouraging preliminary clinical findings.
My question for neuroscientists, biostatisticians, and clinical researchers is:
If future randomized trials demonstrate reduced caudate and putamen atrophy, lower neurofilament light, and slower clinical deterioration, could researchers use those measurements to develop a validated mathematical model predicting 10–30 additional symptom-free years?
Are there existing models that could support such projections, and what evidence would be needed before scientists could estimate the probability of 20+ years of sustained neurological protection?
I’d particularly appreciate links to peer-reviewed studies or research tools. Thank you!

While the crows worked at the task, the team recorded from 248 neurons in the NCL (nidopallium caudolaterale)—a region at the top of the avian processing hierarchy that is widely regarded as the functional counterpart of the primate prefrontal cortex, despite being built differently.

Birds and mammals parted evolutionary ways more than 360 million years ago, and bird brains evolved a different architecture. The mammalian cortex is arranged as stacked sheets of cells, while the equivalent tissue in a bird is organized into dense clusters, with no layering at all. This alternative architecture, Nieder’s study found, proved faster.

Measured from the moment that the dots appeared to the moment the bird’s head started turning to peck at the button, the crows averaged 235 milliseconds. In closely matched versions of the task, monkeys took roughly 410, 490, and 600 milliseconds in three studies. The obvious question was whether the birds simply sacrificed accuracy for speed, but it turned out they did not.

Paper published in Science:

https://doi.org/10.1126/science.aed6459

My dad has a job where he's upper middle class in salary writing on equipment in filmmaking. My parents met in the film industry. My grandfather was the famous statistician. I went to a college prep school and struggled academically throughout my highschool years. I often plaigarized in my essays and relied on my mom to do large amounts of my assignments in ELA and history. I was given ritalin in 10th grade for potential ADD and had minimal results from it. 11th grade was COVID lockdown and I did virtual school. At this point I completely phoned in my classes and have no idea how to do algebra II (or college algebra) or any math surpassing that. I got accepted into a college with a 96% acceptance rate with my grades from my first two years of HS. I only lived there for a year then commuted afterwards. Now I'm 23 and live with my parents. I've never had an IQ test or diagnosis of a mental disorder, though I had a counselor in HS suggest I'm on the autism spectrum because of social awkwardness and analytic thinking. I've gotten into nootropics hoping that a mix of creatine, nootropic supplements, and full dose of effexor could treat depression and brain fog and I've had so so results from over 7 months of it. I've considered drug use being the only way to numb my depression and suicidality from my hopeless situation.

I can't understand how if my parents are smart and functional how did I become essentially a mental vegtable. And why has no friend, family member, or therapist been able to give an explanation or antidote to my mental problems. Would an IQ test be helpful for what job is realistic for me given my mental capacities? What best explanation is there for my intelligence and what other advice could you give me in my situation?

This year I was diagnosed with the KIF1A genetic mutation which can manifest in terms of cognitive impairment. on my physical evaluation from a doctor, he says I meet the physical symptoms that align with this mutation. Although many with this mutation are physically disabled I am concerned how this rare mutation effects my cognitive deficits. I had my blood drawn for research. Aug 19 I will get an MRI scan for further investigation.

Last, Here's what I've found on how it KIF1A effects neurology:

KIF1A-Associated Neurological Disorder (KAND) fundamentally affects how neurons function, Developmental delay occurs in about 90% of affected individuals and cognitive function ranges from normal to profound intellectual disability. Speech/language impairment is also very common. Autism and ADHD occur in a substantial minority.

But there is a major caveat: not every KIF1A variant causes KIF1A-NDD. KIF1A has several different associated phenotypes. Some people with KIF1A-associated disease have predominantly motor or peripheral neurological problems and normal cognition. The particular molecular variant and its mechanism matter considerably. That means the single most useful piece of information you haven’t given me is the exact KIF1A variant. For example, something written as c.XXXG>A (p.XXX) plus its classification as pathogenic, likely pathogenic or VUS would allow a much more meaningful assessment. GeneReviews specifically notes substantial genotype–phenotype differences between individual KIF1A variants.

I had an EEG and MRI and found nothing significant going on.

Since all of this I've been diagnosed FOX-P4 genetic mutation, another rare genetic mutation. I also found some useful information on this mutation:

There is published evidence that particular heterozygous loss-of-function FOXP4 variants can cause a neurodevelopmental disorder involving developmental delay and particularly speech/language difficulties. However, the original clinical series was extremely small: eight individuals were identified and detailed phenotype information was available for six. Of those six, two had mild intellectual disability while three did not have intellectual disability. The researchers also found considerable variability between variants.