E-ISSN : 2733-4538
It is well-known that post-traumatic stress symptoms are associated with dysfunctional information processing of traumatic events. Until now, the role of bilateral(horizontal) eye movements, a core component of EMDR(eye movement desensitization & reprocessing), has not been theoretically clarified. The purpose of the present study was to investigate the effects of traumatic experience and bilateral eye movements on trauma-related and neutral memory using a false memory paradigm originally developed by Deese(1959) and modified by Roediger and McDermott(1995). In order to achieve these goals, two experiments were performed. Main independent variables assessed were traumatic experience(traumatized vs. non-traumatized), eye movements(horizontal vs. vertical), and word lists(trauma-related vs. neutral). Dependent variables assessed were the correct recognition rate for studied words, the false recognition rate for critical lures, the false alarm rate for unrelated words, and the response times for each of the word lists. Participants were divided into two groups: a traumatized group who experienced a traumatic event and had at least moderate symptoms of post-traumatic stress disorder(15 or above on Post-traumatic Diagnostic Scale; Foa, 1995) and a non-traumatized group. The results show that traumatized participants generated less correct recognition of studied words and more false alarms of unrelated words than controls(Experiment 1 & Experiment 2). Further, bilateral eye movements were associated with a slower response time to previously presented trauma-related words among traumatized participants(Experiment 2). Limitations of the current study and implications for future research were also discussed.
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