Aviation, Space and Environmental Medicine is the monthly journal of the Aerospace Medical Association (ASMA), a non-profit organization of physicians, physiologists, psychologists, nurses, engineers, and others working to solve the problems of human existence in threatening environments on or beneath the earth or the sea, in the air, or in outer space. The original scientific articles in this journal provide the latest available information on investigations into such areas as changes in ambient pressure, motion sickness, increased or decreased gravitational forces, thermal stresses, vision, fatigue, circadian rhythms, psychological stress, artificial environments, predictors of success, health maintenance, human factors engineering, clinical care, and others. This journal also publishes notes on scientific news and technical items of interest, and provides teaching material and reviews for health care professionals. Abstracts of the original research papers in this journal are available.