Philosophy of Science - Cosmic Horizons

Disorders of Consciousness: When the Brain Is Aware But Cannot Show It

July 19, 2026 by Mark Cox

Disorders of consciousness reveal that awareness can exist without behavioral expression, challenging how we diagnose and treat patients. In 2006, a woman lay in a hospital bed in Cambridge, clinically diagnosed as being in a vegetative state. She showed no behavioral signs of awareness. She did not track movement, respond to commands, or demonstrate any of the criteria neurologists use to infer consciousness. By every clinical standard, the lights were off. Then neuroscientist Adrian Owen asked her to imagine playing tennis. Her supplementary motor area lit up on the fMRI scan, the same pattern seen in healthy volunteers imagining the same thing. He asked her to imagine walking through her Read more

Neurons, the cells that drive decision-making

Free Will and Neuroscience: What the Science Actually Shows

July 19, 2026 by Mark Cox

If you think you are reading this sentence because you decided to, a 1983 experiment suggests your brain had already begun preparing the decision before you were aware of it. The question feels urgent in a way most philosophy does not. If free will is an illusion, then no one has ever truly chosen anything. Every decision, what to eat, who to love, whether to commit a crime, was already determined by prior causes stretching back before you were born. Moral responsibility, punishment, praise: all of it rests on a foundation that may not exist. Neuroscience has not settled the debate. It has made it harder to ignore. What Free Read more

The human brain, seat of conscious experience

The Hard Problem of Consciousness: Why the Brain Alone Can’t Explain Your Inner Life

July 19, 2026 by Mark Cox

The hard problem of consciousness sits at the intersection of neuroscience, physics, and philosophy: and it remains unsolved. Before we can detect minds elsewhere in the universe, we need to understand what a mind actually is. The Easy Problems and the Hard One In 1995, philosopher David Chalmers drew a line down the middle of consciousness research. On one side sat the “easy problems”: not easy in the sense of simple, but in the sense that science knows what kind of answer to look for. How does the brain integrate sensory information? How does attention work? How do we report mental states? These are hard in practice, but tractable: the Read more

reproducibility crisis science — A scientist in a laboratory conducting experiments, representing the challenges of reproducible research.

The Reproducibility Crisis: When Science Gets It Wrong

July 19, 2026 by Mark Cox

In 2011, a pharmaceutical company called Bayer reported something alarming. Its researchers had attempted to reproduce the results of 67 published studies they were considering as the basis for drug development. Only 14 of those studies, about 21%, produced results consistent with the original findings. A year later, Glenn Begley and Lee Ellis at Amgen tried to reproduce 53 landmark cancer biology papers. Six held up. Forty-seven did not. These weren’t fringe papers. They were published in prestigious journals, peer-reviewed, and cited hundreds of times. They had been treated as established scientific facts. Science, it turned out, had a problem. What Is the Reproducibility Crisis? Reproducibility is the bedrock of Read more

bayesian reasoning science — A researcher analyzing statistical data, representing probability and Bayesian reasoning in science.

Bayesian Reasoning: How Scientists Think About Probability

July 19, 2026 by Mark Cox

Every day, scientists face the same fundamental challenge: the evidence is never perfect, the measurements are always noisy, and the answer is never fully certain. How do you decide what to believe when certainty is off the table? For most of the 20th century, science answered this question with a statistical framework called frequentism: probability as the long-run frequency of repeated events. But a competing approach, rooted in an 18th-century theorem by an English minister, has become increasingly central to modern science: Bayesian reasoning. Bayesian reasoning is how you rationally update your beliefs when new evidence arrives. It is simultaneously a theorem in probability theory, a philosophy of science, and Read more

Integrated Information Theory: Is Consciousness Just a Number?

July 19, 2026 by Mark Cox

Imagine a patient in a vegetative state, unresponsive for months. Her eyes open, she breathes, but no command, no stimulus, elicits recognition. Then, using a technique derived from Integrated Information Theory, doctors find a subtle signature of complex electrical activity in her posterior cortex. She is later shown to have fragments of awareness. What these doctors measured was not a thought, not a feeling, but something more fundamental – a quantity called phi. Consciousness is easy to experience and hard to explain. Most theories describe what consciousness does: how it integrates sensory input, directs attention, generates behavior. Integrated Information Theory does something different. It claims to describe what consciousness is. Read more

Psilocybe mushrooms, a source of psychedelic compounds

Psychedelics and Consciousness: What Brain Science Has Learned

July 19, 2026 by Mark Cox

For most of the 20th century, psychedelic compounds were effectively off-limits to science. Schedules and stigma made research nearly impossible. The pharmacology was known; what these compounds did in the brain was not. Today, research on psychedelics and consciousness is booming. That changed. Beginning in the early 2000s, a handful of research groups, at Imperial College London, Johns Hopkins University, NYU, and a growing number of other institutions, began running rigorous clinical trials with psilocybin, LSD, DMT, and ketamine. These studies have dramatically expanded our understanding of psychedelic brain effects and their implications for consciousness research. What they found transformed both psychiatry and the science of consciousness. What Psychedelics Do Read more

occam's razor science — A razor blade representing the principle of parsimony — cutting away unnecessary complexity in scientific reasoning.

Occam’s Razor: The Principle That Guides Scientific Thinking

July 19, 2026 by Mark Cox

“Entities should not be multiplied beyond necessity.” When you have two explanations for a mystery, which one should you trust first? This 14th-century maxim, attributed to the English friar William of Ockham, became one of the most influential principles in the history of science. Known as Occam’s razor: the principle that simpler explanations are preferred over more complex ones – it is a rule of parsimony: when multiple explanations fit the evidence equally well, prefer the simplest one. Occam’s razor doesn’t guarantee truth. It doesn’t tell you which explanation is correct. It tells you which one to try first: and in centuries of scientific practice, that has turned out to Read more