Dhyāna in Buddhism the Japanese Rinzai school, but it also occurs in other schools or branches of Zen depending on the teaching line. The Zen student's mastery of a given kōan is presented to the teacher in a private interview (referred to in Japanese as "dokusan" (独参), "daisan" (代参), or "sanzen" (参禅)). While there is no unique answer to a kōan, practitioners are expected to demonstrate their understanding of the kōan and of Zen through their responses. The teacher may approve or disapprove of the answer and guide the student in the right direction. The interaction with a Zen teacher is central in
Buddhism in the United States and Australia. In 1995, he and his organization split with Sanbo Kyodan in response to reorganization of the latter following Yamada's death. The Pacific Zen Institute led by John Tarrant, Aitken's first Dharma successor, continues as an independent Zen line. There are also Zen teachers of Chinese Chán, Korean Seon, and Vietnamese Thien. In 1962, Hsuan Hua moved to San Francisco's Chinatown, where, in addition to Zen, he taught Chinese Pure Land, Tiantai, Vinaya, and Vajrayana Buddhism. Initially, his students were mostly ethnic Chinese, but he eventually attracted a range of followers. Sheng-yen first visited the United States in 1978