There are different types of meditation, each of which uses a different mental strategy (e.g., concentration, mindfulness, and visualization) and has specific impacts on one's mental state. Visualization activates centers in the spatial visual cortex; concentration involves the attention circuitry in the prefrontal cortex (but not the visual area). A new scientific field, contemplative neuroscience, has begun mapping how different types engage the brain and what benefits are provided. (Goleman, Daniel. The Brain and Emotional Intelligence: New Insights. pp 37-39. MA: More Than Sound, 2011)

Meditation and visualization are effective in helping you to maintain a healthy brain.(Newberg, Andrew, MD, and Mark Robert Waldman. How God Changes Your Brain—Breakthrough Findings from a Leading Neuroscientist. pp 151-165. NY: Ballantine Books, 2009.)