Question

the video shows that prayer or can physically change the activity in a persons brain.
deity meditation ancestor artifact energy temple neuroscience transformation ritual manifestation

Explanation:

The sentence is about an activity (along with prayer) that can change brain activity. "Meditation" is a practice that has been scientifically shown (in neuroscience studies) to affect brain activity. Other words like "deity" (a god), "ancestor" (a forebear), "artifact" (an object made by a human), "energy" (a physical quantity), "temple" (a place of worship), "neuroscience" (a field, not an activity), "transformation" (a general change, not an activity here), "ritual" (a more general set of actions often religious, less specific to brain - activity change like meditation), "manifestation" (an expression, not an activity that directly changes brain activity) do not fit as well as "meditation".

Answer:

meditation