I've been trying to do some observations lately about some of the stuff that goes on on the inside, and I wanted to try describing some of the different mechanisms that I can identify. Specifically, the types of thought that exist within the human brain, the way these thoughts behave, the way they "look," etc.

Highly prominent in the mind is the thought composed of Image, and of this I think there are probably a few different types. There's associative image, which is probably just recall in response to an external input: "hey, this thing looks like that other thing I remember." There's also creative imagery, which is the subject's conscious attempt to construct and impose an image into their own mind.
Now, there's also the fact that we as humans tend to understand our own perceptions through the very idea of image, (the reason we call it imagination and say "I see," and so on), but I think that's a bit of a different topic since it's about how thought works instead of what thought is.

Mindvoice is another, usually highly prominent method of thought, and it seems to be inextricably tied to entirely other types of goings-on inside and outside of the individual brain. (This is a significant one to me in terms of my own narrative and perceptions, but I haven't organized all my thoughts about it yet, so it'll take some ruminating time before I want to post more about it.)

Both of those types of thoughts require a different kind of consciousness focus than what I might call more "immersive" types of thought flow, and these seem to have less strict form. (I'll try to divide and organize these types, since that's just kind of what I tend to do, but  as usual such a delineation is going to be incomplete)

There's certainly a narrative immersion thought of some kind, usually associated with memory. Image can be a part of memory, but it is certainly not the only component. The subject already perpetually exists in a state of narrative observation, internally experiencing an entire whole of perception at all times. Whatever format this whole exists in seems to get partially reconstructed through the process of memory, and the subject sort of swims through , or is carried through, this type of thought. Unless interrupted, it has a movement and momentum, the mechanics of which I haven't yet observed closely.

Another type of thought that I find difficult to differentiate and describe is the puzzle-solving logic process. The occasions that I've tried to notice myself thinking this way and observe it have been difficult. There doesn't seem to be any consistent "format" that I can yet see. Memory is often a component, sometimes even immersively, but the pieces of perception for this type of thought seem to come from anywhere, and interacting with them appears to be an interaction with something that I don't have words for yet and so will call abstraction. Perhaps the basic unit for this type of thought is the idea? I also wouldn't know how to describe the 'form' of an idea, except as a component of constructive (and destructive) thought.
Recognition of pattern, manipulation of symbol, bits of corresponding information, the simple act of creation through this process, the brain tends to do this by default, background or foreground, which might be why it's difficult to see or even notice. If I'm not mistaken, it has a certain autonomy, and is foundational to the structure of subjective reality, and at times works collectively. I wouldn't know how to directly investigate the bond between an individual mind's processes and a subjective structure (composition?) of any stability, but some of my models predict how that bond might function. (Alternatively, you could say I've produced some speculative fiction about how reality might work. Without a decent scientific method here, I'm sort of flying blind.)

Then there's attention-focus, associated with object and mindfulness, which I would suggest is also a type of thought, or at least utilizes thought processes even if the internal experience is very different from these other types. Essentially the process is simple, just directing awareness to external inputs of experiential content. It creates memories and associations and probably activates a slew of other subconscious activities. This type of thought can often be difficult to sustain, except for a curious little collective phenomenon that I will probably talk about later on sometime.

Well, that's what I have for now. Provided I keep on living for a little while, I will have more occasion to observe these things, and I'll come back with any other ideas that I have.