Integrated Information Theory proposes that consciousness arises from the interactions of information within a system, and that the level of consciousness is determined by the degree of integration of information within the system.

The key concept of Integrated Information Theory is integrated information, which is a measure of the degree to which information is integrated within a system.

Integrated information is measured by the degree to which information is integrated within the system, which is determined by the number of connections between neurons, the amount of information that is processed by the system, and the level of consciousness of the system.

Integrated Information Theory proposes that integrated information is a necessary but not sufficient condition for consciousness, meaning that a system must have a certain level of integrated information in order to be conscious, but having a high level of integrated information does not guarantee consciousness.

Integrated Information Theory has been criticized for being too vague and not providing a clear definition of consciousness, for being based on a flawed understanding of information and integration, and for not being falsifiable and cannot be tested experimentally.