https://www.pnas.org/doi/10.1073/pnas.0407401101 But did Dilgo Khyentse Rinpoche train his brain with a brain scanner? Brain scanner where not yet available at his time. At the age of 15, Dilgo Khyentse Rinpoche went into solitary retreat. But he did not go into a cave with a brain scanner. He took spiritual teachings with him. And he practiced …