Snippets from Mike Johnson's Principia Qualia (2016) for my own future reference. The Principia Qualia "attempts to chart a viable course toward a general theory of valence, a.k.a. universal, substrate-independent principles that apply equally to and are precisely true in all conscious entities, be they humans, non-human animals, aliens, or conscious AI".
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Johnson claims that while valence in the human brain is a complex phenomenon which defies simple description (as summarised in Fig 1 below), valence itself isn't necessarily a complex phenomenon; instead he thinks it's "a crisp thing we can quantify, and the patterns in it only look incredibly messy because we’re looking at it from the wrong level of abstraction".
The right level of abstraction involves "understanding valence research as a subset of qualia research, and qualia research as a problem in information theory and/or physics, rather than neuroscience", hence entails seeking "general principles for how the causal organization of a physical system generates or corresponds to its phenomenology, or how it feels to subjectively be that system". This in turn requires addressing more general questions of consciousness and qualia. Johnson rejects top-down theories of consciousness (constructed around how it feels and the high-level dynamics of how the brain implements what we experience) because (1) "we have no reason to expect that our high-level internal phenomenology has any crisp, intuitive correspondence with the underlying physics and organizational principles which give rise to it", which suggests "theories of consciousness or valence which take high-level psychological concepts as primitives will be “leaky abstractions”", and (2) they're not always testable. The set of bottom-up theories of consciousness (Johnson's rule of thumb: "it should apply clearly and equally to any arbitrary cubic foot of space-time, and offer testable predictions at multiple levels of a