>Negative symptoms of dissociation are generally held to refer to losses of function, such as memory (i.e., amnesia), higher cortical functions, loss of feeling, loss of motor control, as well as loss of somatosensory perceptions, for example, numbness. Positive symptoms may include intrusive traumatic memories, flashbacks, intrusive voices, as well as intentions, emotions, cognitions, and behaviors, including complex patterns such as reenactments.
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>Clinical observations indicate that dissociation can manifest in somatoform ways (e.g., Nemiah, 1991). Somatoform dissociation includes many somatic and sensorimotor phenomena and can present in a variety of ways that include sensory distortions, motor weakness, freezing, numbing, paralysis, and tremors (Nijenhuis, 1999). Shaking and convulsions are also common, as are sleepiness, attentional impairment, and headaches and other pain sensations that may be much less obvious.
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>-Neurobiology and Treatment of Traumatic Dissociation

It doesn’t appear connected to Dissociation, and instead some neurobiological deficit. However lucid dreaming has a weak correlation to dissociation but shares some neurobiological substrates. If it’s psychogenic and another part can imagine, then it might fall under something like somatization.

Also maybe a deficit in your thalamus which is the part of your brain that transfers all sensory information sans smell to your higher cortices.
That has been theorized to be related to possible experiences of DP/DR. Along with changes in the Anterior Cingulate, which determines if people -and environments feel safe. Something something Occipital lobe, and parietal lobe, play a part.

Then we take into account maybe it’s something like an encoding or retrieval error, trying to retrieve the mental imagery from your hippocampus.

I’m really reaching right now though, from what I understand it has only been identified and given a name recently.

Edit: sources.

Neurobiology of Traumatic Dissociation

Lucid Dream, Psychosis, Dissociation, and insight

Edit 2: More digging suggest maybe depersonalization as a possible cause. Which would share all those pesky substrates I mentioned. I’m done for now. There’s just not enough research I can find.

Last link. it’s 23 pages and I haven’t finished read it yet.

> I've gotten fleeting moments of what you're describing

That's awesome. I wish you more of them. If you're interested + have a good library, this is where I fist read about it:

https://www.amazon.com/Neurobiology-Treatment-Traumatic-Dissociation-Embodied/dp/0826106315