Stress Disorders:
Cortical Plasticity, Eye Saccades, and Multiple Personalities.
ã 1993
Bruce E.
Morton and *Sandra L. Paulsen
Honolulu, Hawaii
Origin and Nature of Stress Disorders:
The Defense Response occurs as part of the switch from
fearful flight (Ego) to cornered, fearless fight (Id) whereby the individual
attempts to obtain freedom from restraint through the violence of defensive
attack. The activation of the
hypothalamic-pituitary-adrenal (HPA) axis is part of this response. Stress Disorders are pathological states
resulting in inappropriate, repeated activation of the Defense Response. They appear to be produced from a
maladaptive cortical plasticity that occurred whenever the Defense Response failed
to protect the organism from trauma.
The cortical
plasticity appears to result from neurochemical facilitation of pre-existing
cortical synaptic connections to cause unconscious stimulus
generalization. This causes the
organism to respond defensively to any current stimuli that might be related to
the past trauma. Stimulus
generalization causes the present neutral stimuli to be subconsciously
reconnected to the original trauma with all its poly-sensory memories, negative
emotions, and altered states of consciousness.
It also automatically reactivates the Defense Response tied to the
original trauma.
Certain
stress disorders are caused by maladaptive cortical plasticity from trauma in
adulthood (Post-traumatic Stress Disorder, Chronic Pain and Fatigue Syndromes,
Post-partum depression, etc.). Other
stress disorders result from arrests of childhood critical periods of brain
psychosocial development (OCD, certain neuroses, and psychoses). It appears that stress disorders afflict essentially
everyone. Many ancient and newer
methods temporarily relieve some stress disorder symptoms, often by elevating
brain serotonin levels.
Stimulus-generalization is a form of cortical plasticity tied to memory,
learning, conditioned response, and long-term potentiation. The critical period of feline visual
development is the best-studied cortical plasticity system. It has revealed three specific conditions
which must be met before cortical plasticity can occur: visual input, horizontal rapid eye movement
saccades, and cortical norepinephrine (NE) release from locus coeruleus (LC)
activation, either in eustress, (play) or in distress (trauma). Clearly, in PTSD and other stress disorders
the original trauma included each of these three elements and would be expected
to cause cortical plasticity-induced stimulus-generalization.
How EMDR Works to Eliminate Stress Disorders, Such as
PTSD:
Eye Movement
Desensitization and Reprogramming (EMDR) treatment of PTSD also inadvertently
supplies all three of these requirements for cortical plasticity, i.e., it
superimposes therapist-directed eye saccades upon standard
flooding-desensitization techniques.
This procedure has led to an in-session quantifiable reduction of upset
and the measurable acceptance of a client-constructed statements accepting
their traumas. Furthermore, the
desensitization produced in session, appears to last indefinitely out of
session at least for adult traumatization.
The acceptance statement (a strategic element in PTSD treatment) appears
to enable the ego to accept and "experience" the reptilian
pre-memory- bound trauma, and thereby to abstract and integrate it into
conscious awareness, including conscious memory access, so that current neutral
stimuli remain neutral.
The Relationship of Traumatic Production of Stimulus‑Generalization
and the Formation of Multiple Personalities: Under conditions repeated or
pervasive trauma, the ego apparently can not adequately protect itself from
confronting death by simple denial and repression. An additional ego defense is the creation of one or more
fictional identities to insert between the true identity and the incidents of
raw trauma, so as to keep isolated from it.
As a result, entire memory segments associated with the false identity are
laid down, and can be exited and reentered from specific stimulus-generalizing
gateways. When an altered personality
memory system is reentered, it would of necessity take on the surprising and
disturbing familiarity of a dream from REM sleep. In theory, the trauma cannot be desensitized and reprogrammed by
EMDR unless the person enters each false personality first and discharges it,
then enters the true personality and completes that process.