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NIH article contiued: ncbi.nlm.nih.gov/pmc/articles/PMC2944261/
In what follows we summarize the changes in the brain that occur during each of these styles of meditation practice. Such changes include alterations in patterns of brain function assessed with functional magnetic resonance imaging (fMRI), changes in the cortical evoked response to visual stimuli that reflect the impact of meditation on attention, and alterations in amplitude and synchrony of high frequency oscillations that probably play an important role in connectivity among widespread circuitry in the brain.
FA Meditation [Focused Attention]
A recent study [4] used fMRI to interrogate the neural correlates of FA meditation in experts and novices. The study compared FA meditation on an external visual point to a rest condition during which participants do not use meditation and are simply instructed to adopt a neutral baseline state. The meditation condition was associated with activation in multiple brain regions implicated in monitoring (dorsolateral prefrontal cortex), engaging attention (visual cortex), and attentional orienting (e.g., the superior frontal sulcus, the supplementary motor area, and the intraparietal sulcus).
Although this meditation-related activation pattern was generally stronger for long-term-practitioners compared to novices, activity in many brain areas involved in FA meditation showed in an inverted u-shaped curve for both classes of subjects. Whereas expert meditators with an average of 19,000 hours of practice showed stronger activation in these areas than the novices, expert meditators with an average of 44,000 practice hours showed less activation. This inverted u-shaped function resembles the learning curve associated with skill acquisition in other domains of expertise, such as language acquisition. The findings support the idea that, after extensive FA meditation training, minimal effort is necessary to sustain attentional focus.
Expert meditators also showed less activation than novices in the amygdala during FA meditation in response to emotional sounds. Activation in this affective region correlated negatively with hours of practice in life, as shown in Figure 1(A). This finding may support the idea that, advanced levels of concentration are associated with a significant decrease in emotionally reactive behaviors that are incompatible with stability of concentration.
Article continues on the next post.Collectively these findings support the view that attention is a trainable skill that can be enhanced through the mental practice of FA meditation.