Normal 0 Too imprecise. Give us something substantive to consider. What do you mean by non-dual samadhi. Whose non-dual samadhi? Gaudapada in the Mandukya Karikas? Shankara in his Bhagavad Gita commentary? Abhinavagupta? Longchenpa? AbnAl-Arabi? St. Symeon the New Theologian, St. Gregory Palamas? Radharani in Goloka Vrindavana? What is non-dual compassion? How can compassion be non-dual since it involves an other? In Buddhism the Brahma-Vihara meditations are not considered adequate to generate liberation either in Theravada or Mahayana but they can generate a full dhyana-samapatti. Is this what you mean or are you discussing something else. If so what is it? Who are these advanced Patanjali meditators? Where and when were their neurological signatures studied? What studies of non-dual meditators demonstrate significant parallels with Patanjali meditators. What studies are you talking about? Where can we find these studies? Why should anyone believe that neurological brainwave activity is a definitive indicator of anything spiritual? This sounds like TM speak. This is a question that has never been answered by anyone, most especially by neurologists. It all appears to be sets of inferences linked to a-prior assumptions. This is especially true of the TMO. Why parrot it if you hate it? Vaj: One of the fastest ways, if not the fastest way to generate nondual samadhi is to learn the practice of nondual compassion meditation. It actually generates the same neurological signatures as advanced Patanjali meditators in samadhi.