meditators discover nondual awareness, at first in glimpses, as the focus on objects of consciousness gradually drops away and they learn to rest in open presence… Awareness and what appears in awareness mutually coemerge in one unified field of presence.
Welwood offers the definitive psychological account of nondual awareness as a progressive meditative attainment in which the subject-object split dissolves into a unified, self-knowing field of presence.
, Toward a Psychology of Awakening Buddhism, Psychotherapy,, 2000thesis