Well, this is interesting.
I've now finished reading Sy Montgomery's book THE SOUL OF AN OCTOPUS, the author's personal account of her interactions with octopuses (including some at the Seattle Aquarium). Worth reading, though I wd have preferred less Montgomery and more octopuses.
As part of a discussion of octopus intelligence, towards the end of her book she mentions The Cambridge Declaration of Consciousness, a 2012 proclamation by a gathering of neuroscientists that some animal species --birds, mammals, octopus-- have the "neurological substrates that generate consciousness"; among the signatories was Stephen Hawkins. It's encouraging to see physiology catching up with observational research.
Reading this makes me look forward to the day when, post-pandemic, we'll be able to visit area aquariums again (being lucky enough to have not one but two, in Seattle and also Tacoma).