As far as mediation goes, it's helped me to heal in a spiritual way. I always feel "cleansed" and peaceful afterward. There's scientific evidence that says mediation re-balances the chemicals in your brain so if you have a excess, such as major depression or anxiety disorders, it helps to reduce...
well this is interesting. I never considered there being a difference. Personally, I listen to music when I meditate and if I focus enough it seems like the music is my consciousness. So, everything considered, I guess that'd be an "internal" mediation?