ScienceWoman has exactly the right idea on combining academia with the profession of being a human being. I was amused at the part of her manifesto that says she’ll draw the line at a moderate work-week of 50-60 hours — it’s a good goal, but it’s strange how it’s simply taken for granted that academics will put in those 10+ hour workdays.
We’ve been talking quite a bit about how information is processed in our brains so that a specific reflexes and cognitive actions can be produced. It’s also the end of the cross country season and my mind has been mixing the two. Take Steve Prefontaine (one of the greatest American long distance runners of all time) for example. I was watching a video clip of Prefontaine running and paused it right as he was putting his foot down and picking his other leg up. He doesn’t extend his leg out very far. Instead, he lifts his knee up so that he can drive his pronated foot into the ground just under his hip. Since his foot is already pronated, he can further drive his leg behind him and use the ball of his foot as a launch pad to drive himself forward. This technique saves a lot of energy and keeps the runner mostly in the air, rather than on the ground (which is what you want).
Sadly, no one brought the technique to my attention until about halfway through college. I’ve been overextending my legs without picking up my knees, landing on my heels, and rolling to the balls of my feet. This means I use more energy and a lot more time in projecting myself forward each stride. Ever since I learned of proper running techniques I’ve been trying to make them an automatic reflex in my strides, but this is incredibly hard to do.
For the past twenty two years, neurons in the motor cortex of my frontal cortex, cerebellum, Thalamus, and several other regions of my brain have been adapting to coordinate specific muscle actions to create my presently crappy running technique. This spider web of nervous tissue is constantly changing as neurons diverge and converge on each other, become more sensitive to or produce higher concentrations of specific neurotransmitters, and develop other specific interactions with other neurons that perfectly coordinate my behavior and actions. However, it has taken twenty two years to perfectly coordinate all this interaction so that I can run so terribly, meaning that learning to truly run could take a long time as I prune and pair more neurons to coordinate a totally different reflex.
So far I’ve been trying to reshape my neural network by doing one legged hang cleans. In the exercise I have to shrug a large amount of weight off one leg in a lunging position, get under the weight in mid air and catch it as it comes down in the same position. It is difficult to catch the weight without landing on the ball of my foot, which is pleasantly placed directly under my hips, making my body develop the correct foot placement as a reflex. This learning is actually the reshaping of the network of neurons inside my brain that deal with motor coordination as they make new interactions, destroy old ones, change their amplification of signals, or change their functions completely. At any rate, I haven’t even scratched the surface of how intertwined the processes are that go inside this skull of mine to create who I am and the things that I do. But I do find the little I know pretty amazing, and can only hope that my non-declarative memory will eventually kick in.
To see the proper running form, take a look at Michael Johnson in his world record 200m race.at the 1996 olympics.
I found an article about new brain cells that I thought was really interesting. Researchers at the Yale School of Medicine discovered the mechanism behind how new neural cells are integrated into the adult brain. It turns out that new neural cells take a while to mature and fully integrate themselves into existing neural networks in the brain. While they are maturing, they rely on signals from other brain regions so that they do not disturb ongoing functions of the brain. They can receive input from these other regions for up to 10 days before they are ready to make any of their own outputs. So how long does it take to fully develop their synaptic connections so that they can talk to one another? Up to 3 weeks.
So why do we care; what is significant about this discovery? This mechanism sheds light on how neural cells integrate themselves into existing networks, which will impact how stem cells are used to replace neurons lost to injury or disease. The main concern is about neurons firing inappropriately, which could cause seizures or cognitive dysfunction.
The full article can be found in the Journal of Neuroscience, Vol. 27
This is a troubling story if you just read the right-wing perspective: a student at Hamline University (an excellent liberal arts college in the Twin Cities) was suspended for writing a letter to the university administration. That shouldn’t happen, I’d say — we want to encourage free speech. Even if the student seems to be a bit of a far-right nut, and if the letter was supporting that lunatic idea that school massacres wouldn’t happen if everyone were carrying a concealed weapon, people should have the privilege of expressing their opinions.
So I read John Leo’s opinion piece on the issue and was actually agreeing with him, which was a curious sensation in itself. He didn’t actually quote any pieces of the letter in question, though, which was a little odd. So I looked up the letter from Troy Scheffler on the web. Uh-oh.
This is the last time I’ll pester you, I promise. The DonorsChoose challenge ends after the end of this month, and we’ve done well. We met my goal of raising $20,000 dollars, 200 freethinkers have stepped up to make donations, and 30 of my 31 chosen projects have been fully funded. That does mean that there is one project that isn’t quite there yet: Embryology in the Classroom is $292 shy of completion. If a few more could chip in a few more dollars, we can achieve perfection.
Good work, everyone!
Hello again, it’s been a while so I thought I’d drop in a comment or two about what I’ve found recently in the news about neurobio. I’ve lately been reading about neurotransmitters and how they bind to sites in specific neurons, instigating depolarization across the membrane of the neuron and allowing for an action potential to communicate to hundreds of thousands of other neurons. This communication between neurons in the central nervous system is relayed into actions in the peripheral nervous system resulting in behavior. But how is this synchronized? What neuron does what? What must be connected to what and why? These are all questions that may take a while to be answered, but we are finding new developments everyday.
In an article from Cornell News, I read about an experiment by James Goodson and Andrew Bass (2000) in which neurotransmitters’ role in the display of sex characteristics in plainfin midshipman fish were examined. In this particular fish, males will make vocal calls through the water that attract females who will come to the site to lay eggs for the vocalizing male to fertilize. However, a second type of male that is unable to make vocal calls waits nearby so that once the eggs are laid, he can get some free-fertilization-action.
Goodson and Bass anesthetized and stimulated the anterior portion of the hypothalamus in each fish to stimulate either a vocal call, or the female’s short grunt (a response to the male’s call). After stimulating normal calls in each fish, the neurotransmitters isotocin and vasotocin (identical to the mammalian oxytocin and vasopressin) were administered to the anterior hypothalamus of each fish. When administered, fish that normally could make calls lost the ability to do so and developed female like grunts, similar to the type II males that could not call but rather grunted like females. This meant that a trait that was typically thought to be controlled by sex (controlled or linked by the gonads) was actually independent, and regulated completely by the brain.
Who knows how many of our traits are linked to gonad development, probably much fewer than we might originally think. If I was given a good dose of estrogen would I not want to play football or wrestle with my best friends?…doubtful (it might just turn into flag football with the Vikes or a pillow fight). At any rate, we shouldn’t be so quick to make judgment calls on biology’s effects in gender behavior.
If you’re still interested in weighing in on whether the academic meetings in San Diego should go on in the wake of fires in Southern California, Terra Sigillata has a thread on that very subject.
I promise the small meeting I’m planning to attend won’t clog up the freeways.
See that little thermometer to the right? It says we’ve met our challenge of raising $20,000 for school kids. However, I actually picked a number of projects that required more money than that, and we still have 3 projects that are not fully funded — and they’re the embryology/developmental biology grants! We’ve got less than a week left, so it would be very nice if people would kick in the last few donations to complete these last few requests.
We’re very, very close and time is running out. Let’s get all of the projects fully funded!
Homer Jacobson wrote a paper 52 years ago in which he speculated about the chemical conditions underlying the origin of life. After discovering that the paper is frequently cited by creationists, and after reviewing the work and finding multiple errors, he has retracted the paper. Good for him. It won’t matter to the creationists, though; this paper will continue to get cited and mangled and misused.
The writeup makes an excellent point.
It is not unusual for scientists to publish papers and, if they discover evidence that challenges them, to announce they were wrong. The idea that all scientific knowledge is provisional, able to be challenged and overturned, is one thing that separates matters of science from matters of faith.
Yes. Science has an integrity and dedication to the honest evaluation of the evidence that religion lacks.
Florida Ciizens for Science reports that their brand new state science standards are available for comment. That means you can click over there and make suggestions, even if you aren’t a Florida educator (they do ask for your connection, so don’t worry that the creationist mob can just descend on this poor document and taint it). Make good, productive, constructive suggestions, and help the kids of Florida.
I haven’t gone through it carefully yet, but my general impression is that the evolution standards are broad, but good; on the other hand, the organismal biology standards read like a med school prep course, and don’t say much about the concepts of physiology. So they’re not bad, but they could use some improvement…so help them out!
