– recent brain research attracts worldwide attention

The brain shows more signs of relaxation during meditation than during ordinary rest. Nondirective meditation has a greater impact than does concentrative meditation, especially in parts of the cortex associated with the processing of stress, emotions, and memories.

brain in nondirective meditationIn February 2014, the scientific journal Frontiers in Human Neuroscience published an article with a long and for most of us rather obscure title:
Nondirective meditation activates default mode network and areas associated with memory retrieval and emotional processing

The article was written by eight authors from the Norwegian University of Science and Technology, St. Olav’s Hospital, the University of Oslo, and the University of Sydney. None of the authors had expected the article to become a bestseller, but it is in the process of becoming just that.

Number 1

Half a year after the article was published online, it had been viewed nearly 16,000 times, and 1,100 people had downloaded it for use on their computers. The article got more attention on the web than did any other article published in the journal at the same time, and it was among the top one percentile of all scientific papers ever tracked.

A quick google search on “nondirective meditation” quickly confirms that the content has aroused greater interest than its cryptic title would suggest. The World Wide Web is full of references to the article. News channels such as Fox News, the Daily Mail, CTV News, Aftenposten in Norway, the Delhi Daily News in India, Yahoo News in Singapore, China Daily in Taiwan and many other news media carry the good news. The same is true of popular scientific publications and websites: Psychology Today, Science Daily, WorldHealth.net and Clinical Research Society.

On the websites, there are questions: “How does the brain work during meditation?” “Which meditation should you try?” “Does meditation make a person smarter?” But there are also answers: “Can’t clear your thoughts when you meditate? It might be better that way.”

The message is clear: “Researchers discover how the brain works during meditation”. “A little mind wandering during meditation helps us process emotions.” “‘Nondirective’ meditation is most effective according to neuroscientists.” “When it comes to meditation, you’re probably trying too hard.”

Subsequent to the scientific article, some people have even set up a website where you can share news about nondirective meditation. The concept has evoked interest, and the message seems to have hit home.

In the scientific context, success is measured by how often an article is cited by other scientific articles. It is too early to assess whether or not the article we are discussing here will be a success based on such criteria. But in readership and popular impact, it has enjoyed great success since it was available online in February.

Meditation and mind wandering

What is the article about? Let’s use the title as our starting point. For those of us who are not familiar with the brain’s anatomy, “default mode network” may be the most difficult notion in the title, but nevertheless of great interest. The default mode network is the part of the cortex that is active when we are at rest. The scientist Marcus Raichle discovered that this part of the brain has low activity during demanding tasks and high activity when we relax. The activity in this part of the cortex is associated with mind wandering, i. e. thoughts, images and emotions that pass through the mind, especially when we relax.

This brings us to the term “nondirective meditation”. According to the article, this refers to meditation techniques practiced with a relaxed focus of attention that permits spontaneously occurring thoughts, images, sensations, memories and emotions to emerge and pass freely, without any expectation that mind wandering should abate. The study examined the effect of Acem Meditation. Like a number of other methods – Relaxation Response, TM, and Clinically Standardized Meditation – Acem Meditation involves the effortless mental repetition of a meditation sound, while the mind’s spontaneous activities come and go freely. These methods differ from concentrative techniques, where the goal is to keep a clear and pure focus and thus reduce mind wandering.

One of the goals of the study was to examine the impact nondirective meditation has on the default mode network.

Active rest better than passive

The subjects had extensive experience with Acem Meditation. They were asked to do three things while an fMRI machine scanned their brain activity:

  1. Mentally repeat a meditation sound while spontaneous thoughts were allowed to come and go (nondirective meditation);
  2. Relax, rest, and wait;
  3. Mentally repeat the meditation sound with concentration, trying to avoid being absorbed by spontaneous thoughts (concentrative meditation).

It turned out that the repetition of the meditation sound, both in a nondirective way and with concentration, increased the activity of the default mode network more than did ordinary rest. This suggests that there was more mind wandering, and that the subjects obtained deeper relaxation.

This is interesting for our understanding of this part of the cortex. The so-called default mode turns out not to be simply the mode the brain reverts to when nothing else happens, as the term might indicate. Both nondirective and concentrative meditation are more active than is ordinary, passive rest, but they still have a much greater impact on the default mode network.

The results are also interesting for our understanding of meditation. While it is widely believed that meditation reduces mind wandering, this study indicates the opposite. Both nondirective and concentrative repetition of the meditation sound appeared to increase mind wandering.

Nondirective meditation “most effective”

Furthermore, it appears that nondirective meditation has a greater impact than does concentration. This is what makes news media and science websites proclaim that nondirective meditation is “most effective”.

Brain in meditation

The images on the left show the brain during concentrative meditation, while the images on the right show the brain during nondirective meditation. The highlighted areas show activity in the default mode network beyond that which occurs during ordinary rest. Photo: NTNU

The difference between nondirective and concentrative meditation was greatest in areas of the brain associated with episodic and emotional memories. This includes parts of the cortex linked to mind wandering. It also involves other parts of the brain, particularly the hippocampus, which stores episodic memories from our life, and the amygdala, which is important for emotional memories related to stress. It has been suggested that the simultaneous activation of all three areas stimulates the processing of stressful emotional memories.

The results indicate that nondirective meditation gives more room for the processing of emotions and memories than does concentrative meditation. This may be the underlying mechanism behind the stress reduction obtained through nondirective meditation.

Jian Xu, Alexandra Vik, Inge Rasmus Groote, Jim Lagopoulos, Are Holen, Øyvind Ellingsen, Asta K Håberg, Svend Davanger: “Nondirective meditation activate default mode network and areas associated with memory retrieval and emotional processing,” Frontiers in Human Neuroscience 2014 (fnhum.2014.00086)

Author: Halvor Eifring
Translator: Anne Grete Hersoug
Language editor: Ann Kunish