Thoughts move in the subtle ether. Besides Vayu is not just this physical Vayu. It is the power that lifts, expands and transfers everything within Space. It is everywhere even as all the five elements are everywhere, either involved and hence inactive or else active and hence recognizable. Also mind is not in the brain. The brain is only a receiving and transmitting organ. Human speech is only a gross outer manifestation of certain inner vibrations that take the form of sound and word and we call as speech.
Affectionately,
Alok Da