As an Eliminative Materialist, the word consciousness has too much different meanings to be used to make real science, especially in neuroscience. It is a catch-all buzzword full of ancient, cultural and religious implications.

There is consciousness mechanisms at a low level in the brain stem that are also related to awareness; or our animality. Consciousness on the other side, require intelligence. In that way, we can talk about the evolution of consciousness through history and prehistory (like with the bicameral chamber theory of consciousness). These two sides are intertwined like reason and emotion.

A few month ago (beginning of 2024), there was an article about ChatGPT having consciousness. If I remember well it was because the company inserted a new layer of AI that was giving it kind of thinking about what it was thinking. It is a systemic perspective for consciousness a meta level: how thought are organized.

Imho, "consciousness" like other functions are deeply and finely integrated in our body. This is the point of view of Radical Embodiment Neuroscience. Therefore, within this perspective, any AGI can't be "conscious" because they are only heads, with no bodies.

This is our magnificent bodies, with all their wonderful features, that make us intelligent, thus conscious. The mind uploading, or the genius head in a jar is just nonsensical Hollywood scenario.

Hope it helps