Thinking mind is not in the head – when you think that it’s in the head, it is only a concept (an idea). The mind base is nowhere – sometimes yogis think it’s in the heart or brain.
Actually, the mind is nowhere – when you notice the mind, you just know that it is happening. When we think that it is in the heart, head, or anywhere, it is just the mind thinking of a location; actually it is nowhere.
Take hearing consciousness as an example – for beginners, sound happens outside, a distance away. As they practice and awareness improves, it happens in the ears; later, when the yogi can be aware of the mind, the sound happens in the mind, not in the ears. (It depends on your level of understanding.)
When you notice thoughts in the head, do they appear in the left side, right side, front, or back of the head?