This is day #0.
This is day #0.
We actually have pictures that great of Mars, a planet about 225 million kilometers (140 million miles) away from us.
Image copyright: NASA
A five-year old’s brain is an energy monster. It uses twice as much glucose (the energy that fuels the brain) as that of a full-grown adult, a new study led by Northwestern University anthropologists has found.
The study helps to solve the long-standing mystery of why human children grow so slowly compared with our closest animal relatives.
It shows that energy funneled to the brain dominates the human body’s metabolism early in life and is likely the reason why humans grow at a pace more typical of a reptile than a mammal during childhood.
Results of the study will be published the week of Aug. 25 in the journal Proceedings of the National Academy of Sciences.
"Our findings suggest that our bodies can’t afford to grow faster during the toddler and childhood years because a huge quantity of resources is required to fuel the developing human brain," said Christopher Kuzawa, first author of the study and a professor of anthropology at Northwestern’s Weinberg College of Arts and Sciences. "As humans we have so much to learn, and that learning requires a complex and energy-hungry brain."
Kuzawa also is a faculty fellow at the Institute for Policy Research at Northwestern.
The study is the first to pool existing PET and MRI brain scan data — which measure glucose uptake and brain volume, respectively — to show that the ages when the brain gobbles the most resources are also the ages when body growth is slowest. At 4 years of age, when this “brain drain” is at its peak and body growth slows to its minimum, the brain burns through resources at a rate equivalent to 66 percent of what the entire body uses at rest.
The findings support a long-standing hypothesis in anthropology that children grow so slowly, and are dependent for so long, because the human body needs to shunt a huge fraction of its resources to the brain during childhood, leaving little to be devoted to body growth. It also helps explain some common observations that many parents may have.
"After a certain age it becomes difficult to guess a toddler or young child’s age by their size," Kuzawa said. "Instead you have to listen to their speech and watch their behavior. Our study suggests that this is no accident. Body growth grinds nearly to a halt at the ages when brain development is happening at a lightning pace, because the brain is sapping up the available resources."
It was previously believed that the brain’s resource burden on the body was largest at birth, when the size of the brain relative to the body is greatest. The researchers found instead that the brain maxes out its glucose use at age 5. At age 4 the brain consumes glucose at a rate comparable to 66 percent of the body’s resting metabolic rate (or more than 40 percent of the body’s total energy expenditure).
"The mid-childhood peak in brain costs has to do with the fact that synapses, connections in the brain, max out at this age, when we learn so many of the things we need to know to be successful humans," Kuzawa said.
"At its peak in childhood, the brain burns through two-thirds of the calories the entire body uses at rest, much more than other primate species," said William Leonard, co-author of the study. "To compensate for these heavy energy demands of our big brains, children grow more slowly and are less physically active during this age range. Our findings strongly suggest that humans evolved to grow slowly during this time in order to free up fuel for our expensive, busy childhood brains."
We are now beginning to crack the brain’s code, which allows us to answer such bizarre questions as “what is the speed of thought?” When he was asked, as a joke, to explain how the mind works in fi…
Another small step toward understanding and dare I say it… READ thoughts? I’ve definitely mentioned this at some point in the past year, once the patterns appear, it’s only a matter of time before they’re reverse engineered to make sense.
The psychology of color in persuasion.
Mental health and psychological well-being does not, and never has received the same level of consideration and respect (not to mention funding) as physical health and fitness. Why?Is it because th…
I’m posting this partly to emphasize the importance of mental health. And partly because I’ve recently noticed a big number of people with less than ideal opinions on the matter.
It’s absolutely disgraceful.
We live in a culture that really enjoys the idealised version of productivity. We measure our days in meetings and coffees, long hours and beating deadlines. But are we really doing our best work, or are we cheer-leading an attitude that is counterproductive?
Someone will argue and say this: “But I can do JUST fine with 4 hours of sleep a day!” No - you can’t, it might seem that way, but it’s not what you should be doing to use your brain power to the fullest.
7 - 8 hours of sleep is recommended. It doesn’t matter how old you are, male or female, just work out your day and plan to get enough sleep.
Manage your energy, not your time.
Musically trained children and adults show enhanced performance on several aspects of executive functioning - a strong predictor of academic success.
This is no longer surprising, but it’s exactly the sort of thing you can expect from neuroscience. I think I’d be inclined to push the notion that putting kids through music lessons is a good choice for both parents and children. Besides; music is great.