near-death experience, phenomenon reported by some people who have been clinically dead, then returned to life. Descriptions of the experience differ slightly in detail from person to person, but usually share some basic elements: a feeling of being outside one's body, a sensation of sliding down a long tunnel, and the appearance of a bright light at the end of that tunnel. The light is sometimes described as a benevolent "being of light" who directs the person in a review of his or her life so far and ultimately prevents the person from crossing some sort of boundary that signifies death. Most people who have had a near-death experience report that it strongly influences their subsequent lives, relieving anxiety about death and increasing their sense of purpose and their sensitivity to others.

Research into the near-death experience was pioneered by Raymond Moody, who published Life After Life in 1975 after studying 150 people who had had such experiences. He and other scientists, such as cardiologist Michael Sabom, found that possible physiological and psychological causes for the phenomenon, including lack of oxygen to the brain, the influence of anesthetics, disruptions in neurotransmitter release, and prior expectations, could not sufficiently account for the experiences these people described. Their findings and a belief in a spiritual explanation for the phenomenon have been supported by Elisabeth Kübler-Ross, who pioneered the study of death and dying in the United States beginning in the late 1960s.

Near-death experience is an emotional issue, believed to be a profound spiritual experience by some and criticized as wish fulfillment by others. Many skeptical scientists believe that it is a simple physiological event misconstrued by people who have a compelling psychological need or who are comforted by interpreting the experience in terms of their religious or spiritual beliefs.

experience, living through events and the impression on a person or animal of events. In epistemology, a distinction is made between things known inductively, from experience, and those known deductively or theoretically, from a priori principles. The ancients, under the influence of Plato and of Euclidean geometry, tended to prize deductive or theoretical knowledge above that gained through experience. Their influence was dominant through the Renaissance. With the rise of modern empirical science the preference was reversed. Immanuel Kant's critical epistemology, however, emphasized the dependence of all experience on the mediation of the intelligence. Modern thought has tended to agree with Kant; accordingly, discussion has centered on what, if anything, can be said to be immediately experience, and how this experience may be conditioned by social factors affecting the social milieu or by perceptual processes themselves.