The New York Times, August 8, 2019

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Scientists have discovered what is by far the oldest evidence of human occupation at extreme altitudes: a rock shelter strewn with bones, tools and hearths 11,000 feet above sea level. People lived at the site, in the mountains of Ethiopia, as long as 47,000 years ago.

The research, reported on Thursday in the journal Science, contradicts the long-held view that high elevations were the last places on Earth settled by humans.

That notion was based more on assumptions than hard evidence, it now appears. In East Africa, paleoanthropologists have long focused their attention on the Rift Valley and other archaeological sites at lower elevations.

Continue reading “In the Ethiopian Mountains, Ancient Humans Were Living the High Life”

The New York Times, July 18, 2019

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In a laboratory at the Stanford University School of Medicine, the mice are seeing things. And it’s not because they’ve been given drugs.

With new laser technology, scientists have triggered specific hallucinations in mice by switching on a few neurons with beams of light. The researchers reported the results on Thursday in the journal Science.

The technique promises to provide clues to how the billions of neurons in the brain make sense of the environment. Eventually the research also may lead to new treatments for psychological disorders, including uncontrollable hallucinations.

Continue reading “Why Are These Mice Hallucinating? Scientists Are in Their Heads”

Discover, March 25, 2019

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If you had to sum up the past 40 years of research on the mind, you could do worse than to call it the Rise of the Zombies.

We like to see ourselves as being completely conscious of our thought processes, of how we feel, of the decisions we make and our reasons for making them. When we act, it is our conscious selves doing the acting. But starting in the late 1960s, psychologists and neurologists began to find evidence that our self-aware part is not always in charge. Researchers discovered that we are deeply influenced by perceptions, thoughts, feelings, and desires about which we have no awareness. Their research raised the disturbing possibility that much of what we think and do is thought and done by an unconscious part of the brain—an inner zombie.

Continue reading “Meet Your Secret Master”

Discover, March 25, 2019

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I am going to do my best to hold your attention until the very last word of this column. Actually, I know it’s futile. Along the way, your mind will wander off, then return, then drift away again. But I can console myself with some recent research on the subject of mind wandering. Mind wandering is not necessarily the sign of a boring column. It’s just one of the things that make us human.

Everybody knows what it is like for one’s mind to wander, and yet, for a long time psychologists shied away from examining the experience. It seemed too elusive and subjective to study scientifically. Only in the past decade have they even measured just how common mind wandering is. The answer is very.

Continue reading “In Praise of Mindless Time”

Discover, March 25, 2019

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I was looking forward to my first experience with anesthesia. I had been laid out on a stretcher, and nurses and doctors were prepping my midsection so they could slice it open and cut out my appendix. After a bout of appendicitis, a short vacation from consciousness seemed like a pleasant way to spend a few hours. I had no idea what anesthesia would actually feel like, though, and suddenly I was seized by skepticism. I tried to hoist myself up, already swabbed in iodine, as I suggested that I ought to pop into the men’s room before the scalpels came out. I wouldn’t want to interrupt the surgery with a bathroom break. “Don’t worry,” one of the nurses replied. “We’ll do that for you.”

Continue reading “The Big Sleep”