Beta and delta brain waves were always present to some degree during wakefulness.

A study published in Neuron, helps us understand the value of delta and beta brain waves in a new way. Basically, the study showed that beta brain waves denote attention and attentiveness while the much slower delta brain waves tell us when to pay attention. It makes sense that we don’t pay attention to everything all the time – we’d be overwhelmed. Some mechanism within us figures out the patterns of attention we need to employ in order to better utilize our attentive powers. Timing is everything…

Through a series of experiments utilizing a brain-computer interface, the study authors discovered that beta and delta brain waves were always present to some degree during wakefulness. The frequency and intensity of the delta wave helped the authors predict when attention would be paid while the frequency and intensity of the beta wave helped them predict how attentive the subject would be at any given time. Fundamentally, this demonstrates that our brains are always bathed in delta AND beta waves during times of outward attention such as when noticing something important or just paying attention to something. The study did not investigate sleep states.

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In the course of evolution, people with certain genes fared better than others – and because they survived, they passed on their genes, making the general population more like them. For example, Europeans who came into contact with and yet survived the great plague did so because they had a genetic advantage over their neighbors. Because more of them survived to pass on their genes, their descendants tend to show that same genetic factor.

Unfortunately, a genetic advantage in one era or age (like the Ice Age) may be a killer in another (like now). More body fat in an Ice Age man made him more likely to pass on his genes; whereas today it could prevent him from doing so.

What genetic factors are a problem in your life? Do you have a predisposition for certain diseases or conditions (physically and psychologically)? How can you know which conditions or diseases are genetically affecting you? How can you make a change that has a higher probability of success on a genetic level – if it is possible at all?

There is a fundamental interaction between genetics and how our brains process the genetic information. We create and maintain brain circuitry based on a genetic blueprint modified by experience/learning (environmental factors). It's a delicate balance between nature and nurture. Neither genetics nor conditioning completely rule our life experience – rather, we experience the result of an interweaving between the two – kind of like the weaving of DNA.

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People who complain that they are more sensitive to sadness or frustration than others and report feeling “hurt” may be telling the truth.

There are approximately three billion base pairs (connections) in a strand of DNA. That represents a virtually infinite number of possible combinations. The variation between each of us, although nearly infinitesimally small, is so significant that no two of us in the world population of nearly 7 billion humans is exactly identical. Even identical twins are different from each other.

It is that small variation in each of us that is the result of and contributes to the evolution of the specie. In a study by UCLA researchers, publishing in Proceedings of the National Academy of Sciences, Markus Heilig, Faculty Member for F1000 Biology, and Chief of the Laboratory of Clinical and Translational Studies at the National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD, report that they have identified a genetic factor that causes some people to actually experience stronger physical sensations associated with emotions (in the study case, the emotion was rejection).

There is apparently a wide variation or spectrum associated with the feeling (physical sensations) of emotions. Therefore, some people who complain that they are more sensitive to sadness or frustration, for example, than others and report feeling emotionally “hurt” may be telling the literal truth.

Can these genetic factors be moderated through training or experience? What do you think? Are we “hard wired” – or can we significantly affect our emotional states in spite of genetic predisposition or genetic variations?

An abstract of the original paper, Variation in the micro-opioid receptor gene (OPRM1) is associated with dispositional and neural sensitivity to social rejection is online at http://www.ncbi.nlm.nih.gov/sites/entrez/19706472?dopt=Abstract&holding=f1000,f1000m,isrctn.

CO2 is heavier than normal air and so will tend to sit at the bottom of your lungs unless you exhale it.

John Wemmie and Michael Welsh of the University of Iowa, Iowa City, reported in the November 25, 2009 issue of the journal Cell, a Cell Press publication, that they have discovered a chemical sensor for carbon dioxide deep in the brain’s emotional center – the amygdala. This part of the brain, when it senses an acidic condition (ph) created by higher levels of CO2 in the body, triggers fight-or-flight behaviors we label panic attacks.

I’ve discussed before in this blog the impact of chemistry, particularly CO2 levels in the body on mood and behavior. This is not a new concept – it’s been known for at least a century (the Chinese knew it millenia ago) that chemical imbalances in the body affect behavior.

If you’re experiencing panic attacks fairly often, it could be that your amygdala is hypersensitive to CO2 levels. You may need to breathe differently to expel excess CO2 and increase the oxygen levels in your body.

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Neuroscientist Fred H. Gage and his colleagues at the Salk Institute examined brain samples from mice. All of the mice showed vivid proof of what’s known as “neurogenesis,” or the creation of new neurons. But the brains of more athletic mice in particular showed many more. These mice, the ones that scampered on running wheels, were producing two to three times as many new neurons as the mice that didn’t exercise.

Since Gage’s discovery, scientists have been finding more evidence that the human brain is not only capable of renewing itself but that exercise speeds the process.

“We’ve always known that our brains control our behavior,” Gage says, “but not that our behavior could control and change the structure of our brains.”

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