Re: differential mechanism/ SUDS/ eye movements

Your name would be appreciated when posting the next time, as this appears to keep dialogues on this board more professional.

SUDS ratings typically refer only to one traumatic memory. Treating one traumatic memory does not necessarily significantly impact PTSD symptomatology, especially in cases with more complex histories.

SUD ratings are also usually taken by the therapist and thus clearly demand characteristics are an issue, as there is no independent evaluator. Nevertheless, even with the latter, demand characteristics and/or expectancy may paly a role.

Expectancy likely plays a role in producing treatment effects in most psychotherapies and quite possibly in faith healings. We know that expectancy is mediated by endogenous opiates. Interestingly enough there is some suggestion that EMDR works better when blocking endogenous opiates, thus reducing the impact of expectancy. This supports the notion of a differential effect for EMDR that is different from a placebo or expectany effect.

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