Although the systematic study of meditation is still in its infancy, research has provided evidence for meditation-induced improvements in psychological and physiological well-being. Moreover, meditation practice has been shown not only to benefit higher-order cognitive functions but also to alter brain activity. Nevertheless, little is known about possible links to brain structure. Using high-resolution MRI data of 44 subjects, we set out to examine the underlying anatomical correlates of long-term meditation with different regional specificity (i.e., global, regional, and local). For this purpose, we applied voxel-based morphometry in association with a recently validated automated parcellation approach. We detected significantly larger gray matter volumes in meditators in the right orbito-frontal cortex (as well as in the right thalamus and left inferior temporal gyrus when co-varying for age and/or lowering applied statistical thresholds). In addition, meditators showed significantly larger volumes of the right hippocampus. Both orbito-frontal and hippocampal regions have been implicated in emotional regulation and response control. Thus, larger volumes in these regions might account for meditators' singular abilities and habits to cultivate positive emotions, retain emotional stability, and engage in mindful behavior. We further suggest that these regional alterations in brain structures constitute part of the underlying neurological correlate of long-term meditation independent of a specific style and practice. Future longitudinal analyses are necessary to establish the presence and direction of a causal link between meditation practice and brain anatomy.

Neuroimage. 2009 Apr 15;45(3):672-8. Luders E, Toga AW, Lepore N, Gaser C. Laboratory of Neuro Imaging, Department of Neurology, UCLA School of Medicine, Los Angeles, CA 90095-7334, USA.

PURPOSE OF REVIEW: Although the literature on complementary therapy, including music, is vast, there are few studies conducted in a scientific fashion exploring physiologic mechanisms. This review summarizes recent evidence on the effects of music on the hypermetabolic response of critical illness. RECENT FINDINGS: Music may restore some of the distorted homeostasis observed in ICU patients, as well as reducing pain and the need for sedation. Music likely reduces alterations in the hypothalamic-anterior pituitary-peripheral hormone axes that produce cortisol and growth hormone. Music may also increase growth hormone levels, which can induce decreased production of cytokines such as IL-6 by white blood cells. Further, ovarian steroid secretion may paradoxically protect women by increasing baseline circulating stress hormones, providing an opportunity for music therapy to intervene effectively. Dopaminergic neurotransmission has been implicated as a means by which music can modulate the central nervous system. SUMMARY: Music may play an important role as an adjunct therapy in critical care. However, further studies are necessary to elucidate how music can be further integrated clinically and the precise underlying mechanisms of its beneficial effects.

Curr Opin Clin Nutr Metab Care. 2008 Nov;11(6):790-4. Nelson A, Hartl W, Jauch KW, Fricchione GL, Benson H, Warshaw AL, Conrad C. Tufts University, School of Medicine, Boston, Massachusetts, USA.