"Some psychologists have hypothesized that EMDR actually desensitizes people to the traumatic material and thus is related to exposure therapy. A more accurate description is that it integrates the traumatic material." (2015, Van der Kolk, "The Body Keeps the Score")
This is more a dogmatic underpinning of Western psychiatry than an actual scientific fact.
For one. one can directly observe in a PET or ffMRI scan that during a flashback or dissociative episode, the right amygdala + associated limbic regions are hyperactivated, but the left MPFC and the left hemispheric speech centers are hyperinhibited.
Patients with a history of trauma have an underactivated and underconnected default mode network. Traumatic experience and sympathetic hyperarousal not only inhibits many DMN structures required for cognitive processing of experience, such as the MPFC and anterior cingulate, but also the thalamus and hippocampus.
Retrieval of traumatic memory is thus often disorganized and involves fairly noncognitive regions and fragmented sensory information. CBT and talk therapy engage the DLPFC, which has no direct connection with the amygdala or even other limbic regions, while engaging the median prefrontal cortex rather poorly, which actually has a direct connection to the the amygdala. EMDR and other somatic forms of therapy work because they activate the MPFC, the amygdala and limbic regions simultaneously in ways that talk therapy and CBT do not. Furthermore, Van der Kolk, who leads the Trauma Center in Boston, argues that traumatic imprints are stored in noncognitive circuits poorly accessed by cognitive therapy but more easily accessed by somatic therapies.
Are you
sure the core issues are
always influenced by the cognitions?
citations
1. A.F. Arnsten, et al. "α-1 Noradrenergic receptor stimulation impairs prefrontal cortical cognitive function.,"
Biological Psychiatry 45, no. 1 (1999) 26-31.
2. Y.D. "Van der Werf et al." "Special Issue: Contributions of thalamic nuclei to declarative memory functioning,"
Cortex 39 (2003); 1047-62.
3. B.M. Elzinga and J.D. Bremner, "Are the neural substrates of memory the final common pathway in Post-traumatic Stress Disorder (PTSD)?"
Journals of Affective Disorders 70 (2002) 1-17
34 L, M. Shin, et al., "A functional magnetic resonance imaging study of amygdala and medial prefrontal cortex responses to overtly presented fearful faces in Post-traumatic Stress Disorder,"
Archives of General Psychiatry 62 (2005) 273-81
5. L, M. Williams et al. "Trauma modulates amygdala and medial prefontal responses to consciously attended fear,"
NeuroImage 29 (2006) 347-57
6. R. A. Lanius, et al. "Brain activation during script-driven imagery-induced dissociative responses in PTSD: a functional magnetic resonance imaging investigation," Biological Psychiatry 52 (2002): 305-11
7. J.E. LeDoux, "Emotion Circuits in the Brain,"
Annual Review of Neuroscience 23, no. 1 (2000): 155-84.
8. J.E. LeDoux: "Extinction of Emotional Learning: Contribution of Medial Prefrontal Cortex,"
Neuroscience Letters 163, no. 1 (1993): 109-113