What Can Alter Consciousness?

What Can Alter Consciousness? Hypnosis. Meditation. Spiritual experience. Learning. Insight. Understanding. Emotional development. Sensitivity training. What are the 4 states of consciousness? Mandukya Upanishad is the source of the Hindu revelations about the Four States of Consciousness and defines these states as waking, dreaming, deep sleep, and turya (the fourth state, which is the state