The thymus, one of the endocrine glands, is located under the breast bone. When you come into your natural state, sensations are felt there. …. They are just a thud. If there is a movement outside of you in your field of vision, that movement is also felt in the thymus.
But by practicing not blinking one will not arrive in this state, one will only strain the eyes. Once you are in your natural state, by some luck or some strange chance, all this happens in its own way.