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Category: neuroscience – Page 996

Where does consciousness come from? And how do our brains create it? A look at one of life’s biggest mysteries

General anesthesia doesn’t just work on your brain or on your mind. It works on your consciousness. By altering the delicate electrochemical balance within the neural circuitry inside your head, the basic ground state of what it is to “be” is — temporarily — abolished. In this process lies one of the greatest remaining mysteries in science, and in philosophy too.

Somehow, within each of our brains, the combined activity of billions of neurons, each one a tiny biological machine, is giving rise to a conscious experience. And not just any conscious experience, your conscious experience, right here, right now.

New study says cataract surgery associated with lower risk of dementia

After analyzing the data, researchers found that participants who underwent cataract surgery had nearly 30 percent lower risk of developing dementia compared with those who did not have the procedure. The study also found that the reduction of risk continued for at least a decade following surgery and was associated specifically with the lower risk of Alzheimer’s.

“This is really exciting because no other medical intervention has shown such a strong association with lessening dementia risk in older individuals,” Cecilia S. Lee, ophthalmologist and the study’s lead author, said in a statement.

MIT Researchers Just Discovered an AI Mimicking the Brain on Its Own

A new study claims machine learning is starting to look a lot like human cognition.

In 2019, The MIT Press Reader published a pair of interviews with Noam Chomsky and Steven Pinker, two of the world’s foremost linguistic and cognitive scientists. The conversations, like the men themselves, vary in their framing and treatment of key issues surrounding their areas of expertise. When asked about machine learning and its contributions to cognitive science, however, their opinions gather under the banner of skepticism and something approaching disappointment.

“In just about every relevant respect it is hard to see how [machine learning] makes any kind of contribution to science,” Chomsky laments, “specifically to cognitive science, whatever value it may have for constructing useful devices or for exploring the properties of the computational processes being employed.”

While Pinker adopts a slightly softer tone, he echoes Chomsky’s lack of enthusiasm for how AI has advanced our understanding of the brain:

“Cognitive science itself became overshadowed by neuroscience in the 1990s and artificial intelligence in this decade, but I think those fields will need to overcome their theoretical barrenness and be reintegrated with the study of cognition — mindless neurophysiology and machine learning have each hit walls when it comes to illuminating intelligence.”

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Researchers Teach Human Brain Cells in a Dish to Play “Pong”

Scientists have successfully taught a collection of human brain cells in a petri dish how to play the video game “Pong” — kind of.

Researchers at the biotechnology startup Cortical Labs have created “ mini-brains ” consisting of 800,000 to one million living human brain cells in a petri dish, New Scientist reports. The cells are placed on top of a microelectrode array that analyzes the neural activity.

We think it’s fair to call them cyborg brains, Brett Kagan, chief scientific officer at Cortical Labs and research lead of the project, told New Scientist.

Risk factors that determine whether you’re more or less likely to develop cognitive decline

As some participants were “lost to follow-up”, the researchers were only able to look at 480 people from the original mild cognitive impairment group. While 142 still had mild cognitive impairment, they found that 62 people from this group now had dementia. The researchers also found that 276 people no longer met the criteria for mild cognitive impairment – showing us that mild cognitive impairment does not always lead to dementia and it isn’t necessarily permanent.

Let’s first look at the factors linked to a lower risk of developing mild cognitive impairment.

The Universe Might Be Able to Bend the Laws of Physics All By Itself

At this point, the paper mingles cosmology, or the study of the universe and its origins, with biology. “We ask whether there might be a mechanism woven into the fabric of the natural world, by means of which the universe could learn its laws,” the authors write. In other words, a universal law might transcend all scientific fields. That means that the laws of physics, as we know them, could be subject to higher-order laws of the universe that control them—and that we can’t even comprehend.

“Exploring links between fields is crucial because knowledge is not fundamentally compartmentalized,” says Bruce Bassett, professor at the University of Cape Town’s Department of Mathematics and head of the Cosmology Group at the African Institute of Mathematical Sciences in South Africa. We humans are simply narrow-minded. “We segment and compress knowledge into biology, and physics, and sociology because of our limited brains, and the cost of that segmentation and compression is that we easily miss the commonalities and hidden universality between branches of human knowledge.”

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