FATIGUE, in psychology, a condition of mind resulting from prolonged mental activity. It is characterized by an increasing inability to pay attention to things, failing memory, and inability to think. It is also accompanied by peculiar organic sensations.
(See EXPERIMENTAL PSYCHOLOGY ; INDUSTRIAL PSYCHOLOGY.) The non-military work carried out by soldiers, such as cleaning the barracks and keeping them in repair, is termed fatigue. For fatigue in muscle, see MUSCLE.