Howard Gardner first published his theory of multiple intelligences in his 1983 book Frames of Mind. The theory proposes that intelligence exists in several distinct forms rather than just one general cognitive ability. Gardner identified seven main intelligences: linguistic, logical-mathematical, musical, bodily-kinesthetic, spatial, interpersonal, and intrapersonal. However, Gardner noted that additional intelligences may exist that are more complex to define. His theory aimed to provide a more comprehensive understanding of human intelligence and learning styles.