I briefly read through the link. There's much to like, but there are some serious issues...
In short, according to IIT, consciousness requires a grouping of elements within a system that have physical cause-effect power upon one another. This in turn implies that only reentrant architecture consisting of feedback loops, whether neural or computational, will realize consciousness. Such groupings make a difference to themselves, not just to outside observers. This constitutes integrated information. Of the various groupings within a system that possess such causal power, one will do so maximally. This local maximum of integrated information is identical to consciousness.
The above is an excerpt from the article. I like the notion of consciousness being existentially dependent upon groupings of basic elements(consciousness "requires"...). There seems a potential issue with talking about the groupings 'making a difference to themselves', and then calling that making of a difference to themselves "integrated information". Leaves me guessing how we can possible say that certain groupings of certain elements are even capable of 'making a difference to themselves'.
First, following from the fundamental Cartesian insight, is the axiom of existence. Consciousness is real and undeniable; moreover, a subject’s consciousness has this reality intrinsically; it exists from its own perspective.
Existing from it's own perspective requires having one. Add Descartes to that, and you've added an additional requirement of taking account of oneself. Having a perspective requires having a worldview. Taking account of oneself requires common language use. So, if we're strictly following these guidelines, and leaning on Descartes, we've already delimited consciousness to self-awareness of language users.
Second, consciousness has composition. In other words, each experience has structure. Color and shape, for example, structure visual experience. Such structure allows for various distinctions.
Third is the axiom of information: the way an experience is distinguishes it from other possible experiences. An experience specifies; it is specific to certain things, distinct from others.
Fourth, consciousness has the characteristic of integration. The elements of an experience are interdependent. For example, the particular colors and shapes that structure a visual conscious state are experienced together. As we read these words, we experience the font-shape and letter-color inseparably. We do not have isolated experiences of each and then add them together. This integration means that consciousness is irreducible to separate elements. Consciousness is unified.
Fifth, consciousness has the property of exclusion. Every experience has borders. Precisely because consciousness specifies certain things, it excludes others. Consciousness also flows at a particular speed.
The second axiom states that consciousness has composition. I would concur. However, the fourth axiom seems to contradict the second. If consciousness has composition, then it consists of individual elements. To know that consciousness has composition requires knowing what those elements are. Although, groupings of elements are not equivalent to individual elements, if consciousness has composition, it must consist of individual elements.
It seems that this distinction between the groups and the individual elements is what grounds the conclusion that individual elements are inadequate, whereas certain groupings have what it takes. I'm not at all opposed to that approach for establishing a criterion for consciousness.
The bit about all consciousness existing from it's own perspective seems to be a springboard from which the theory begins to make claims about consciousness that can only be satisfied by creatures capable of taking account of their own specific state. There's quite a bit of talking about consciousness in ways that we cannot sensibly attribute to anything other than creatures capable of language. The third postulate shows this...
Third, because consciousness is informative, it must specify, or distinguish one experience from others. IIT calls the cause-effect powers of any given mechanism within a system its cause-effect repertoire. The cause-effect repertoires of all the system’s mechanistic elements taken together, it calls its cause-effect structure. This structure, at any given point, is in a particular state. In complex structures, the number of possible states is very high. For a structure to instantiate a particular state is for it to specify that state. The specified state is the particular way that the system is making a difference to itself.
It seems that that is and/or may be the result of taking Descartes too seriously...
Descartes makes a good argument for being aware of one's own existence by virtue of talking about ourselves. However, if we take this too strictly, and posit it as a necessary condition for all consciousness, then we'll have no choice but to deny consciousness to all non-reflective thought/belief, to all non-linguistic creatures, or find ourselves guilty of anthropomorphism.
The theory rests upon the idea that different groupings of basic elements are capable of
'making a difference to themselves'.
That's a big problem if we extend this criterion to AI and other animals without language.