-0+ wrote: ↑December 29th, 2020, 7:33 pm
A dream may be experienced like any other experience, but it is generally considered to be a subconscious experience - not a conscious experience - and it is commonly differentiated from physical reality.
All of these considerations are dependent of a conception that already acknowledges a distinction between reality and non-reality, having assigned reality to an independent domain accessed by conscious experience. That applies even for metaphysical or epistemological solipsists that do not adhere to the belief that there's something real beyond their conscious experience or remain skeptical about it. Those who acknowledge physical reality are just another group of people that are not solipsists, but in any case, whatever anyone thinks is the real thing, that reality is thought to be accessible.
-0+ wrote: ↑December 29th, 2020, 7:33 pm
John could experience "cogito, ergo sum" in a dream, and feel that he is conscious and that what he is experiencing is real, only to wake up and realise it was "just a dream" - not real - he had been sleeping, not conscious in the normal sense of the word.
Evidently, John is a realist who believes in the existence of an objective world accessible to his consciousness, a conception which allows him to make a distinction between real and not real, to conceive a sleep mode, etc. He obviously reached the conclusion that some of his experiences occur only in his imagination and that these experienced events (called dreams) are not direct, real time perceptions of actual events in that world he happens to know already as existing objectively. John is either a dualist, or a material monist. Otherwise he would not be able to conceptualize the idea of a "dream" as something distinct from experiencing the real world. He will use the concept "dream" to differentiate from real, actual events, occurring in an independent world that he still believes is real. If the thought there was no such distinction of events in his experience, there could not be any sleep state to talk about.
-0+ wrote: ↑December 29th, 2020, 7:33 pm
After waking out of a dream, he may feel that he is now fully conscious and experiencing reality, but how can he be so sure (especially if he has experienced dreaming within a dream before)?
He is indeed sure that he is experiencing some reality, he believes his experience is real. What is the nature of that reality is something else.
-0+ wrote: ↑December 29th, 2020, 7:33 pm
How can he test how conscious he is? If he is experiencing something, he can know that he exists, at least as an experiencer, but what can he know about the reality of what he is experiencing?
Those tests, from the point of view of John, will have very little to do with knowing "how conscious he is". That wording comes from an independent observer of John that may be implying the existence of an objective reality in which John is immersed and that John may be more or less in contact with, thus the expectation of some degree of consciousness of it. It wouldn't make much sense to suppose the observer would be talking about a degree of consciousness from John of his own conscious experience.
Once John acknowledges his experience is real and the events in it behave independently of his will, he has given the first necessary steps to know what reality is all about.
-0+ wrote: ↑December 29th, 2020, 7:33 pm
If 'reality' is defined so that any experience (including dream) qualifies as reality, and no experience can qualify as non-reality, then reality becomes insignificant. There needs to be some differentiation between reality and non-reality for either to have significance.
All that is needed for non-reality to have a meaning is that reality is conceived. The nature of reality can be conceived in several ways and each conception will define its attributes, so that for some what is experienced is all there is, that's what reality is, without any reference to an independent world beyond conscious experience. But for some others, reality comprises the conscious experience and a domain of things existing independently of that consciousness.
-0+ wrote: ↑December 29th, 2020, 7:33 pm
Each individual may construct their own model of reality from their experiences, and have some access to this. After communicating with others, it may appear that 'reality' can be divided into: private internal reality (dreams, thoughts, etc) which no one else seems to have direct access to; and public external reality which others seem to be able to access (although others may process this differently).
For an individual to acknowledge the possibility of the existence of "others", this implies an ontological commitment to a conception of reality where there are objects (subjects) independent of himself and which he can interact with. This individual is a realist about other individuals, a conception allowing him the distinction between his private experience and the private experience of others, which he recognizes as real. For a metaphysical solipsist, ontologically speaking, there may be only the private reality of his thoughts and there would be no others. For an epistemological solipsist, there might be an independent domain with others, but this would not be directly accessible, unlike his private thoughts, which he stills acknowledges as being real.
-0+ wrote: ↑December 29th, 2020, 7:33 pm
External reality may be processed into internal reality with varying degrees of accuracy.
As I said, this commitment to a view where there is an external reality distinct from an "internal" reality is already a form of realism where the domain of the real is accessible to conscious experience.
-0+ wrote: ↑December 29th, 2020, 7:33 pm
What are the ramifications of not being to directly access someone else's model of reality?
The ramifications are that, having to use our own model of reality, we test it to see indirectly how it plays out and arrive to inferences. We usually start from the assumption that the others have a similar model of reality as ours and operate accordingly. From these interactions we build a model of how the world in general actually works.