Altered States of Consciousness
Altered States of Consciousness Consciousness is the most intimate feature of human existence — the felt sense of being aware, of experiencing a world, of having a self. Yet this seemingly stable ground shifts more readily than most people realize. An altered state of consciousness (ASC) is any condition in which the normal baseline quality of awareness, perception, cognition, emotion, or sense of self is significantly modified. These states arise through an enormous range of causes: chemical, physiological, psychological, and spiritual. They have been sought deliberately for millennia, experienced involuntarily through illness or injury, and studied scientifically for decades. Defining the Baseline To understand what it means for consciousness to be altered, it helps to first appreciate what ordinary waking consciousness actually is. In the baseline state, sensory input is processed in a predictable hierarchy, time feels linear, the boundary between self and environment is ...