Thank you all for your answers !

Gareth, yes I have read a meta-analyse of Brewin but it doesn't explain the role of dissociation in PTSD.

Justin, this is exactly the problem of my research is to say, the role of dissocation in the development of PTSD. Does dissociation is a mechanism or not? Thank you for your reading recommandation.

Check out the work of Dr. Daniella Schiller at the Mount Siani School of Medicine- she directs the lab of affective neuroscience and is doing some very interesting research and writing on PTSD.

Dear Kerry Altman,

Thank you for this suggestion. Do you have any text to recommend?

You can look at Dr. Schiller's work at her lab at Mount Sinai at:

www.mountsinai.org/profiles/daniela-schiller

not sure why she is not on Research Gate

In line with the previous answer, not directly answering the original question, but nevertheless interesting findings on different brain mechanisms in dissociation vs. PTSD in mothers, by Daniel Schechter and his group. Available in full text in RG.

https://www.researchgate.net/publication/239946355_Limbic_brain_responses_in_mothers_with_post-traumatic_stress_disorder_and_comorbid_dissociation_to_video_clips_of_their_children 

Article Limbic brain responses in mothers with post-traumatic stress...