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In the following article (edited for length; text bolded by the Highlights editor), nondualism meditation is being used to shed light on the little known default network, the one-third of the brain that is quiet when external, goal-oriented tasks are dominant. The default network is personal and subjective. Studies suggest that seasoned nondual meditators are capable of harmonizing the simultaneous activity of both the external and the default networks. People with dementia, autism, and depression also experience both networks at the same time, but they cannot control the involvement of the default network. Studies are underway to test the hypothesis that nondual contemplation does correspond to differences in the default network.
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Contemplating Oneness: The Neuroscience of Meditation
By Carina Storrs, posted
Average people are conscious of either the external world or their personal world, and they alternate their attention between the two. These worlds push us into and pull us out of our awareness.
While neuroscientists have made strides toward understanding the brain activity associated with external tasks, the areas that control self-related thoughts remain shrouded in mystery. Roughly speaking, external or goal-oriented tasks activate regions around the outer part of the brain known as the external network. The default network, on the other hand, is about one-third of the brain nestled inside the external networks crown. It is an area that is quiet when the external network is active, and active when the external network sits idle. While scientists first thought this area might just be active when the brain had no task to focus on, a growing camp of brain researchers, including Josipovic and Heeger, believe that it is the seat of self-related thinking.
To learn about this mysterious network, they are probing the brains of people who practice a type of meditation called nondualism. Unlike common meditation approaches, such as focusing on an external or imaginary object for a prolonged stretch of time, nondualism trains meditators to watch their own minds. All the while they remain fully aware of their surroundings. What I think is important here is the use of trained meditators to get at a subjective mental state, Heeger explains. Because these meditators can control whether they are reflecting on themselves or on external issues, or on both, they can describe their experiences to the researchers after their fMRI. If they achieved a sense of oneness, the researchers can look to see if the machine recorded any unique brain activity that could be associated with this mental state.
Stumbling upon the brains resting network
Dr. Marcus Raichle, a
neurologist at the Washington University School of Medicine in
Experiments in the laboratory of Rafael Malach, a neurobiologist at the Weizmann Institute of Science in Israel, first raised the suspicion that the default network did more than oppose the external network, that it might control self-related thoughts. Malachs team made the surprising discovery that peoples brains responded in identical ways to certain dramatic scenes in films such as The Good, the Bad, and the Ugly and movies by Alfred Hitchcock. But, during other parts of the movies, each viewer had his or her own pattern of brain activity. Malach believes that, during less intense scenes, with less gunshots and bloodshed, people began comparing the action to their own personal experiences, letting their thoughts turn inward. Their brain activity spiked upward in the areas known then as the default network. Now, five years after this neurocinematics study, which was published in Science in 2004, Malach says that, We are [still] very much in the dark about this system.
FMRI-based experiments usually monitor the brain activity of subjects as they respond to stimuli, whereas the default network tends to activate in the absence of external stimuli. This means that fMRI is an unlikely tool for studying the default network. There are no tests to study the wide range of internal thoughts that could come from this network, such as reflections on the past (do I like the shirt I just bought?), or the future (where will I wear that shirt?) or anticipating other peoples opinions (will my friend think that shirt looks good?). These thoughts often pop into our heads seemingly out of nowhere.
Good luck studying spontaneous thought, says Malach. Still, he commends this approach for illuminating the network, saying that the Western-style studies using fMRI scanning fit like a glove on Eastern meditation.
Eastern practices meet Western studies
To learn about the default network and its interplay with the external, Josipovic and Heeger are beginning to piece together a slew of images collected from scanning the brains of Buddhist monks as well as secular meditators from around the Tri-State area. The pair is planning to extend their study to Christian monks, nuns and Jewish contemplatives.
One of the practitioners of nondualism, or oneness meditation, in the study is 31-year-old Karma Drodhul. He became a Lama, or leader of Tibetan Buddhist, through spending about seven years in meditation retreats. The brain scans do not prevent Lama Drodhul from entering a state of oneness. In Buddhism, we are used to meditating through distractions, he says after a recent fMRI session. It was fun.
Josipovic already has some early revelations about the networks. For normal nonmeditators, Josipovics saw the same interplay as other scientists: When the activity of the external network is up, the default is down and vice versa. But the story is different when it comes to experienced meditators. The activity of the two networks for them is not as sharply opposed, perhaps indicating that there is brain activity accompanying the experience of harmony between internal and external perspectives in nondualism meditation.
The default networks broader implications
Understanding the default network may eventually elucidate information about the mental diseases that seem to target it, including Alzheimers, autism and depression. While the activity of the external network is sometimes also affected in these diseases, it is not nearly as broken, says Jessica Andrews-Hanna, who recently completed her graduate studies in the laboratory of Randy Buckner at Harvard University on the default networks of aging people.
The diseases that involve the default network are varied but, for all of them, the network does not seem to turn off when it should. Perhaps because it loses that push-pull relationship with the external network in patients with severe Alzheimers and other cognitive problems, it remains perpetually on. Within the default network, activity is disorganized and connections are deteriorated. Its activity also does not seem to wane in studies of autistic people when they perform goal-related tasks, or of depressed people during rest.
All these studies suggest that there could be a striking similarity between the brains of meditators and those of people with dementia or depression. According to Andrews-Hanna, if its true that meditators maintain their two networks operating at the same time, their brain scans would be reminiscent of those of the mentally ill. Presumably, in the meditators case, maybe its all cognitive; maybe they have the ability to say, Now I want to control these two [networks] together, says Andrews-Hanna. If you can turn the brain regions on and off when you want, thats great.
For now, neuroscientists are waiting to learn what Josipovic and Heeger find from their studies of meditators, which they hope will offer unique insight about the default network. The first step is to see if nondual contemplation combining the external and subjective experiences does correspond to differences in the default network. If it does, these studies will open up a new way to explore what was before a completely elusive network.
read the full article at http://scienceline.org/2009/08/13/storrs-neuroscience-meditation-fmri-brain/
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