Sunday, January 19, 2014

Biology - Brain: Brain Activity During Meditation


The brain is an electrochemical organ - using electromagnetic energy to function. Electrical activity emanating from the brain is displayed in the form of brainwaves.
 
 
There are four categories of these brainwaves. They range from the high amplitude, low frequency delta to the low amplitude, high frequency beta. Men, women and children of all ages experience the same characteristic brainwaves. They are consistent across cultures and country boundaries.

During meditation brain waves alter.
  • BETA - 13-30 cycles per second - awaking awareness, extroversion, concentration, logical thinking - active conversation. A debater would be in high beta. A person making a speech, or a teacher, or a talk show host would all be in beta when they are engaged in their work.
     
  • ALPHA - 7-13 cycles per second - relaxation times, non-arousal, meditation, hypnosis
     
  • THETA - 4-7 cycles per second - day dreaming, dreaming, creativity, meditation, paranormal phenomena, out of body experiences, ESP, shamanic journeys.
A person who is driving on a freeway, and discovers that they can’t recall the last five miles, is often in a theta state - induced by the process of freeway driving. This can also occur in the shower or tub or even while shaving or brushing your hair. It is a state where tasks become so automatic that you can mentally disengage from them. The ideation that can take place during the theta state is often free flow and occurs without censorship or guilt. It is typically a very positive mental state.
  • DELTA - 1.5-4 or less cycles per second - deep dreamless sleep

Biology - Brain: Brain Waves

When you drop a small stone in water, you see waves. Similarly our heart and our brain have wave patterns. The wave pattern of the heart is measured by ECG (electro cardiograph). The brain waves are measured by EEG (electro encephalograph).

Using the brain wave studies, scientists have discovered that our brain waves are of four types.

The brain waves also have peaks that are similar to the peaks we see in water waves. The number of times the peak appears in one second is called "cycles per second ". For example, the electricity in India is of 50 cycles per second.

  • Beta (13 to 25 cycles per second)
    This brain wave indicates that your conscious mind is in control. It indicates a mental state of logical thought, analysis, and action. You are alert and awake talking, speaking, doing, solving problems, etc.
     
  • Alpha (8 to 12 cycles per second)
    This brain wave indicates relaxation and meditation. It is a state of relaxed alertness good for inspiration, learning facts fast.
     
  • Theta (4 to 8 cycles per second)
    Deep meditation. This is associated with life-like imagination. This is best for suggestibility and inspiration. This brain wave is dominant in children of age 2 to 5.
     
  • Delta (0.5 to 4 cycles per second)
    Deep dreamless sleep. Deep relaxation.

Left brain and right brain working together

Usually the left brain and the right brain waves are independent. They reach peaks independent of each other. During meditation and deep relaxation, the left brain waves and the right brain waves happen together.

 
For both, the peaks are reached together. This is called synchronization. Scientists now believe that synchronization makes much greater mind power available. This is associated with learning large amounts of information very quickly as well as with creativity. Brain self-control

Scientists had long believed that brain activity such as brain waves and secretion of brain chemicals were beyond conscious control. But, experiments on Swami Rama of the Himalayas and on biofeedback have now changed that belief. Now it is proven that some people can control their brain waves, etc. 


Musical Ages: How Our Taste in Music Changes Over a Lifetime


Oct. 15, 2013 — The explosion in music consumption over the last century has made 'what you listen to' an important personality construct -- as well as the root of many social and cultural tribes -- and, for many people, their self-perception is closely associated with musical preference. We would perhaps be reluctant to admit that our taste in music alters -- softens even -- as we get older.






Now, a new study suggests that -- while our engagement with it may decline -- music stays important to us as we get older, but the music we like adapts to the particular 'life challenges' we face at different stages of our lives.

It would seem that, unless you die before you get old, your taste in music will probably change to meet social and psychological needs.

One theory put forward by researchers, based on the study, is that we come to music to experiment with identity and define ourselves, and then use it as a social vehicle to establish our group and find a mate, and later as a more solitary expression of our intellect, status and greater emotional understanding.

Researchers say the study is the first to "comprehensively document" the ways people engage with music "from adolescence to middle age." The study is published in the Journal of Personality and Social Psychology.

Using data gathered from more than a quarter of a million people over a ten year period, researchers divided musical genres into five broad, "empirically derived" categories they call the MUSIC model -- mellow, unpretentious, sophisticated, intense, contemporary -- and plotted the patterns of preference across age-groups.

These five categories incorporate multiple genres that share common musical and psychological traits -- such as loudness and complexity.

"The project started with a common conception that musical taste does not evolve after young adulthood. Most academic research to date supported this claim, but -- based on other areas of psychological research and our own experiences -- we were not convinced this was the case," said Arielle Bonneville-Roussy from Cambridge's Department of Psychology, who led the study.


The study found that, unsurprisingly, the first great musical age is adolescence -- defined by a short, sharp burst of 'intense' and the start of a steady climb of 'contemporary'. 'Intense' music -- such as punk and metal -- peaks in adolescence and declines in early adulthood, while 'contemporary' music -- such as pop and rap -- begins a rise that plateaus until early middle age.

"Teenage years are often dominated by the need to establish identity, and music is a cheap, effective way to do this," said Dr Jason Rentfrow, senior researcher on the study.
"Adolescents' quest for independence often takes the shape of a juxtaposed stance to the perceived 'status quo', that of parents and the establishment. 'Intense' music, seen as aggressive, tense and characterised by loud, distorted sounds has the rebellious connotations that allow adolescents to stake a claim for the autonomy that is one of this period's key 'life challenges'."

As 'intense' gives way to the rising tide of 'contemporary' and introduction of 'mellow' -- such as electronic and R & B -- in early adulthood, the next musical age emerges. These two "preference dimensions" are considered "romantic, emotionally positive and danceable," write the researchers.

"Once people overcome the need for autonomy, the next 'life challenge' concerns finding love and being loved -- people who appreciate this 'you' that has emerged," said Rentfrow.

"What we took away from the results is that these forms of music reinforce the desire for intimacy and complement settings where people come together with the goal of establishing close relationships -- parties, bars, clubs and so on.

"Whereas the first musical age is about asserting independence, the next appears to be more about gaining acceptance from others."

As we settle down and middle age begins to creep in, the last musical age, as identified by the researchers, is dominated by 'sophisticated' -- such as jazz and classical -- and 'unpretentious' -- such as country, folk and blues.

Researchers write that both these dimensions are seen as "positive and relaxing" -- with 'sophisticated' indicating the complex aesthetic of high culture that could be linked to social status and perceived intellect, while 'unpretentious' echoes sentiments of family, love and loss -- emotionally direct music that speaks to the experiences most will have had by this life stage.

"As we settle into ourselves and acquire more resources to express ourselves -- career, home, family, car -- music remains an extension of this, and at this stage there are aspects of wanting to promote social status, intellect and wealth that play into the increased gravitation towards 'sophisticated' music," said Rentfrow, "as social standing is seen as a key 'life challenge' to be achieved by this point."

"At the same time, for many this life stage is frequently exhausted by work and family, and there is a requirement for relaxing, emotive music for those rare down times that reflects the other major 'life challenge' of this stage -- that of nurturing a family and maintaining long-term relationships, perhaps the hardest of all."

Adds Bonneville-Roussy: "Due to our very large sample size, gathered from online forms and social media channels, we were able to find very robust age trends in musical taste. I find it fascinating to see how seemingly trivial behaviour such as music listening relates to so many psychological aspects, such as personality and age."

Link: http://www.sciencedaily.com/releases/2013/10/131015123654.htm

Finding Right Meditation Technique Key to User Satisfaction


July 6, 2012 — New to meditation and already thinking about quitting? You may have simply chosen the wrong method. A new study published online July 7 in Explore: The Journal of Science and Healing highlights the importance of ensuring that new meditators select methods with which they are most comfortable, rather than those that are most popular. 



If they do, they are likely to stick with it, says Adam Burke, the author of the study. If not, there is a higher chance they may abandon meditation altogether, losing out on its myriad personal and medical benefits. Burke is a professor of Health Education at SF State and the director of SF State's Institute for Holistic Health Studies.

"Because of the increase in both general and clinical use of meditation, you want to make sure you're finding the right method for each person," he said. Although meditation has become significantly more popular in the U.S., Burke said, there have been very few studies comparing multiple methods head to head to examine individual preference or specific clinical benefits.

To better understand user preference, Burke compared four popular meditation methods -- Mantra, Mindfulness, Zen and Qigong Visualization -- to see if novice meditation practitioners favored one over the others. The study's 247 participants were taught each method and asked to practice at home and, at the end of the study, evaluate which they preferred. The two simpler methods, Mantra and Mindfulness, were preferred by 31 percent of study participants. Zen and Qigong had smaller but still sizable contingents of adherents, with 22 percent and 14.8 percent of participants preferring them, respectively.
The results show the value of providing new practitioners a simpler, more accessible method of meditation. But they also emphasize that no one technique is best for everyone, and even less common methods are preferred by certain people. Older participants, who grew up when Zen was becoming one of the first meditation techniques to gain attention in the U.S., in particular were more likely to prefer that method.

"It was interesting that Mantra and Mindfulness were found to be equally compelling by participants despite the fact that they are fundamentally different techniques," Burke said. Mindfulness is the most recent meditation technique to gain widespread popularity, he added, and is often the only one with which a novice practitioner or health professional is familiar. Not surprisingly, Mindfulness was the method most preferred by the youngest participants.

"If someone is exposed to a particular technique through the media or a healthcare provider, they might assume because it's popular it's the best for everyone," Burke said. "But that's like saying because a pink dress or a blue sport coat is popular this year, it's going to look good on everybody. In truth, different people like different things. One size does not fit all."

If an individual is not comfortable with a specific method for any reason, he said, they may be less likely to continue meditating and would lose out on such benefits as reduced stress, lower blood pressure or even treatment for addiction.

Burke hopes to see more comparative meditation studies, especially to determine if particular methods are better at addressing specific health issues, such as addiction. If that's the case, he said, healthcare professionals would be able to guide patients toward techniques that will be most effective for them. Additional studies are also needed to determine if there is a way to predict which method will be best suited for any particular individual, he said.


Brain Waves and Meditation


Mar. 31, 2010 — Forget about crystals and candles, and about sitting and breathing in awkward ways. Meditation research explores how the brain works when we refrain from concentration, rumination and intentional thinking. Electrical brain waves suggest that mental activity during meditation is wakeful and relaxed.



"Given the popularity and effectiveness of meditation as a means of alleviating stress and maintaining good health, there is a pressing need for a rigorous investigation of how it affects brain function," says Professor Jim Lagopoulos of Sydney University, Australia. Lagopoulos is the principal investigator of a joint study between his university and researchers from the Norwegian University of Science and Technology (NTNU) on changes in electrical brain activity during nondirective meditation.

Constant brain waves

Whether we are mentally active, resting or asleep, the brain always has some level of electrical activity. The study monitored the frequency and location of electrical brain waves through the use of EEG (electroencephalography). EEG electrodes were placed in standard locations of the scalp using a custom-made hat

Participants were experienced practitioners of Acem Meditation, a nondirective method developed in Norway. They were asked to rest, eyes closed, for 20 minutes, and to meditate for another 20 minutes, in random order. The abundance and location of slow to fast electrical brain waves (delta, theta, alpha, beta) provide a good indication of brain activity.

Relaxed attention with theta

During meditation, theta waves were most abundant in the frontal and middle parts of the brain.

"These types of waves likely originate from a relaxed attention that monitors our inner experiences. Here lies a significant difference between meditation and relaxing without any specific technique," emphasizes Lagopoulos.

"Previous studies have shown that theta waves indicate deep relaxation and occur more frequently in highly experienced meditation practitioners. The source is probably frontal parts of the brain, which are associated with monitoring of other mental processes."

"When we measure mental calm, these regions signal to lower parts of the brain, inducing the physical relaxation response that occurs during meditation."

Silent experiences with alpha


Alpha waves were more abundant in the posterior parts of the brain during meditation than during simple relaxation. They are characteristic of wakeful rest.

"This wave type has been used as a universal sign of relaxation during meditation and other types of rest," comments Professor Øyvind Ellingsen from NTNU. "The amount of alpha waves increases when the brain relaxes from intentional, goal-oriented tasks.This is a sign of deep relaxation, -- but it does not mean that the mind is void."

Neuroimaging studies by Malia F. Mason and co-workers at Dartmouth College NH suggest that the normal resting state of the brain is a silent current of thoughts, images and memories that is not induced by sensory input or intentional reasoning, but emerges spontaneously "from within."

"Spontaneous wandering of the mind is something you become more aware of and familiar with when you meditate," continues Ellingsen, who is an experienced practitioner. "This default activity of the brain is often underestimated. It probably represents a kind of mental processing that connects various experiences and emotional residues, puts them into perspective and lays them to rest."

Different from sleep

Delta waves are characteristic of sleep. There was little delta during the relaxing and meditative tasks, confirming that nondirective meditation is different from sleep.

Beta waves occur when the brain is working on goal-oriented tasks, such as planning a date or reflecting actively over a particular issue. EEG showed few beta waves during meditation and resting.

"These findings indicate that you step away from problem solving both when relaxing and during meditation," says Ellingsen.

Nondirective versus concentration



Several studies indicate better relaxation and stress management by meditation techniques where you refrain from trying to control the content of the mind.

"These methods are often described as nondirective, because practitioners do not actively pursue a particular experience or state of mind. They cultivate the ability to tolerate the spontaneous wandering of the mind without getting too much involved. Instead of concentrating on getting away from stressful thought and emotions, you simple let them pass in an effortless way."

Take home message

Nondirective meditation yields more marked changes in electrical brain wave activity associated with wakeful, relaxed attention, than just resting without any specific mental technique.

Source: http://www.sciencedaily.com/releases/2010/03/100319210631.htm
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