While randomly browsing across interesting courses on iTunes university, which I enjoy listening to while cooking or doing random housework, I discovered Stanford's 'How to Think Like a Psychologist".
The third lecture of this series is titled "Meditation, Anxiety and the Brain", by Dr. Phillipe Goldin who masterfully blends neuroscience, psychology and Eastern meditation practice.
Not only is it very interesting to see how meditation actually influences the patterns that can be seen in the brain, it also can work as a motivation for you to get started on meditation.
Consider meditation the necessary mental training your body needs, just like it needs exercise. I previously discussed how you can make it a habit, and a recommend all (PhD) students to use meditation to bring more clarity and focus to their minds.