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 almost 40% of members are based outside of North America. Although open to all areas of experimental and cognitive psychology, its members typically study areas 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".