Difficult to say. Because until recently depersonalisation was very unknown and undiagnosed so the research into the disorder had little funding and was done at one location in the US and one in the UK. So, everything has small samples sizes. Different types of brain scans, drug trials and rTMS trial are all very small.It makes the risk of error of replication high. I only know of 2. who have tried the right VLPFC and felt some effect. I have never read a post of someone trying the right TPJ and had any benefit from it. In a very small german trial from last year they tried 4.persons with rTMS with a combination of CBT and rTMS.
2.was given rTMS at the right TPJ and 2. was given it at the right VLPFC. The case report said that those in the TPJ both had a reduction and only one at the right VLPFC. How big their reduction was i don´t know. It was a case report. But, in the TPJ trials those who responded had the lest reduction in emotional numbing. They where still symptomatic with emotional numbing. It was mostly derealisation that was reduced at this location among those who had a response.
These trials are based on brain scanning done between 2000-2012. So, in a way they are old. The right VLPFC was chosen because in some scans this location was active when people with DP saw aversive pictures. The right VLPFC is not a regulator of emotions by itself. It more delegates to other areas in the prefrontal cortex to regulate. So, doing inhibitory rTMS at this location they hoped it might normalise other areas like the right DLPFC, left and right medial prefrontal cortex.
If one looks at other studies also those done by the DP unit, the left and right medial prefrontal cortex is central. Some recent studies done in the dissociative subtype in PTSD they find the right medial prefrontal cortex is overactive and makes inhibition of the amygdala so you do not feel fear and anxiety, it also makes a inhibition of some of the reward system.So, the emotional numbing comes by this effect. It affect a structure deep in the brain called the ventral periaqueductal gray that is central in mobilising "fight and flight" responses and "freeze, immobilisation". The ventral part makes immobilization and a parasympathetic state. They says that sensory disintegration is related to this response from the periaqueductal gray. So, it becomes more integrated in the model. These studies are from 2015-2019.
So, the problem in DP with rTMS is that they might not have found the "core"location where is comes from.