Is Meditation just a brain exercise?

A person has seen a study where the scientists studying Buddhist Monks have seen excessive Gamma Rays and certain areas light (that are aligned with Love, Compassion etc) up in their brain.  He wants to know if Meditation is a just an exercise of brain?  Sadhguru goes on to drill into the very understanding of Love, Compassion etc.

Related articles from External Sources

• Meditation increases happiness.
• Change your Mind Change your Brain: The Inner
• Buddhist monk is the world’s happiest man
• Study Shows Meditation Changes Brain after 8 Weeks by Sarah Clare
• Meditation Affects Brain After Weeks: Improves Stress Response, Increases Empathy
• Take a Bit to Sit: How Not Moving Helps You Stay Healthy