First we must ask...is dp a brain illness. From my own perspective, the answer to that question is undoubtedly Yes. Now we ask the question: Is this illness typically treated by neurology? In my case, that answer is NO.
So, for me, dp is a psychiatric illness because it is a brain illness that is dismissed by neurology and by default falls to psychiatry.
From my experience, I would say that dp/dr is specifically a temporal lobe brain issue. The temporal lobe is where sensory input is received and analyzed. It is where memory is accessed and emotional context
is added to the sensory input to give an individual a complete analysis of the self and environment in real time.
Dysfunction in the temporal lobe can result in emotional numbness. This can make close family members seem alien. I have experienced it, and others on this forum have related to it.
Dysfunction in the temporal lobe can cause poor lighting, fluroescent lighting, mirrors and visual clutter to overload the TL, resulting in panic or severe DP. I experienced this frequently in box stores and I have seen
many members relate to this phenomena.
I feel that my failure to resonate with my mirror image is a classic symptom of dp, due to dysfunction in the temporal lobe.
In my case, I know my temporal lobe is responsible because all of my symptoms began with a sequence of powerful temporal lobe seizures, and my EEGs have been abnormal ever since experiencing those seizures.
But, I see a wide variety of complaints on this forum that individuals ascribe to dp. I'm not sure I would diagnose everyone with dp. But, if you have the classic symptoms of dp, then I think you have an illness which
is caused by temporal lobe pathology or dysfunction and is currently treated by psychiatry. In other words, treatment consists of "take this and see if you feel better". Hopefully, someday we can all be upgraded to neurology.
The treatment there is "take this and you will feel better." LOL Not a big upgrade, I know.