On EMDR: Measuring the working memory taxation of various types of eye (non-)movement conditions.

Autor: van Veen SC; Department of Clinical Psychology, Utrecht University, the Netherlands. Electronic address: s.c.vanveen@uu.nl., Kang S; Department of Experimental Clinical and Health Psychology, Ghent University, Belgium., van Schie K; Department of Psychology, Education and Child Studies, Erasmus University Rotterdam, the Netherlands.
Jazyk: angličtina
Zdroj: Journal of behavior therapy and experimental psychiatry [J Behav Ther Exp Psychiatry] 2019 Dec; Vol. 65, pp. 101494. Date of Electronic Publication: 2019 Jun 10.
DOI: 10.1016/j.jbtep.2019.101494
Abstrakt: Background and Objective: A recent, large randomized controlled trial employing different forms of eye (non-)movements in eye movement desensitization and reprocessing (EMDR) showed that fixating the eyes either on a therapist's moving or non-moving hand led to equal reductions in symptoms of post-traumatic stress disorder (PTSD). However, numerous EMDR lab analogue studies found that eye movements produce larger memory effects than eyes stationary. These beneficial effects are typically explained by differences in working memory (WM) taxation. We tested the degree of WM taxation of several eye (non-)movement conditions used in the clinical trial.
Methods: All participants (N = 40) performed: (1) eyes moving by following the experimenter's moving finger, (2) eyes fixed on the experimenter's stationary finger, (3) eyes closed, or (4) looking unfocused into the room. Simultaneously they performed a simple reaction time task. Reaction times are an objective index of the extent to which different dual attention tasks tax WM.
Results: Eyes moving is more taxing than eyes fixed, while eyes fixed did not differ from eyes unfocused. All conditions were more taxing than eyes closed.
Limitations: We studied WM taxation in a laboratory setting; no clinical interventions were applied.
Conclusions: In line with previous lab studies, making eye movements was more taxing than eyes fixed. We discuss why this effect was not observed for reductions in PTSD symptoms in the clinical trial (e.g., differences in dependent variables, sample population, and intervention duration). For more comprehensive future insights, we recommend integration of mechanistically focused lab analogue studies and patient-oriented clinical studies.
(Copyright © 2019 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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