what is anatta during vipassana practice? During vipassana meditation mind experiences breathe automatically. no thoughts were coming. mind itself can be seen.is this anatta?
No. Anatta arises from seeing the arising and passing nature of conditioned phenomena wherever you look. You see that the whole body is like mass of bubbling particles. One set gets destroyed another arises. You also see that this process is not controllable and this process generates sensations which are essentially unsatisfactory. Unpleasant sensations are unsatisfactory, pleasant sensation are unsatisfactory when they end and neutral sensations are unsatisfactory as they are conditioned and pass away giving rise to unsatisfactory experiences.

In addition, craving towards any of the sensation gives rise to the notion or perception of a being. Such perceptions all end in unsatisfactoriness.

Whatever unsatisfactory is not worth identifying as self. This is Anatta.