Jonathan
All this concern over how the processing of received physical input works is irrelevant to a physical theory. A physical theory, which is an attempt to explain physical existence physically, cannot be reliant on the vagaries of how sensory receptors decode what is received, brains interpret, memory, cultural influences, etc, etc. It is relevant in that, as with anything, it would be good to have an answer. That is, when in receipt of physically existent entity X, what happens in a generic human being, or a bat, or a plant (the latter alludes to another tendency to only consider humans, and in respect of observation). The point, as it should do, applies to any sentient organism, and any sensory capability.
Another way of putting this is that following on from an exchange initiated in Ben's blog, I have asked Georgina in her blog: "How do what you call Object & Image Reality have a physical relationship?"
It is not "pre-filtering or pre-processing". I am just stopping at the point in time when the physically existent phenomena are received, since that interaction also results in the cessation of those physical phenomena. That's the physics. So contrary to your next assertion: "which we do not confuse with the issue of subsequent processing as you seemingly do", I am the one not confusing perception/knowledge with reality. More importantly, I am the one differentiating a 'representational reality', which is a physically existent phenomenon, from (for want of a better label) existential reality. In simple terms, there is light, nose, vibration, heat, etc and there is (or more precisely was) what caused that.
Neither am I a "victim perhaps of a confirmation bias" because all I am doing is confirming the existentially closed system we are trapped in. Indeed, here is the fundamental argument (again), if you can see any presumption, please let me know:
1 There is existence of some form or other.
2 We are enabled to be aware of existence via certain physical processes.
3 We are therefore aware of what must, logically, be presumed to be only one possible form of existence. However, that is irrelevant in so far as we cannot transcend our existence, ie we cannot know, either directly or indirectly, something we are not capable of knowing. So, whilst we must assume we are trapped in an existentially closed system, within that we can potentially know everything. The basis of validation being those awareness processes, preferably when effected directly, but properly derived indirect 'awareness' is acceptable.
4 There are two key features of the form of existence that we can know:
a) it exists independently of the processes which detect it
b) there are differences, ie there is alteration.
This means the form of existence we can know (call it physical existence) is existential sequence.
5 In such a sequence, for any given successor to exist, the predecessor must cease to exist. That is, in physical existence, there can only be one physically existent state of the elementary substance which comprises it, at a time.
6 The physical processes which enable awareness have evolved using certain physically existent phenomena which have a particular generic characteristic. So, while they are part of physical existence, from the perspective of the recipient detection processes, they are representations of (what might be labelled) existential reality). That is, they resulted from a physical interaction with that existential reality. Indeed, if it was not for the evolution of those detection processes, they would be of no significance. In fact, if intercepted by an inanimate object, as opposed to the receptor device of any detection system, then they cease to exist and have had no significance.
End of.
The subsequent processing of this physically received input is irrelevant to the physics. Unfortunately(!) it is the only source from which to start determining what actually happened.
Paul