IIT proposes that consciousness is an intrinsic property of certain complex physical systems, and that the level of consciousness of a system is determined by the amount of integrated information that it can process.

IIT defines integrated information as the degree to which information is causally connected within a system. It is a measure of the extent to which the different parts of a system are interdependent.

IIT proposes that integrated information is both necessary and sufficient for consciousness. This means that a system can only be conscious if it has a certain level of integrated information, and that any system that has a certain level of integrated information will be conscious.

IIT has been criticized for being too vague and not providing a clear definition of consciousness. It has also been criticized for being based on a flawed understanding of information and for not being falsifiable and cannot be tested experimentally.

IIT could have a number of implications, including helping us to understand the nature of consciousness, leading to the development of new treatments for disorders of consciousness, and helping us to create artificial consciousness.