The Psychonomic Society is one of the primary societies for general scientific experimental psychology in the United States. It is open to international researchers, and around 25% of members are based outside of North America. Although open to all areas of experimental psychology, its members typically study areas related to cognitive psychology, such as learning, memory, attention, motivation, perception, categorization, decision making, and psycholinguistics. Its name is taken from the word psychonomics, meaning "the science of the laws of the mind".