The many humanitarian crises of recent years, the persistence of conditions of war and the systematic violation of human rights in many countries have forced millions of people to flee, undertaking journeys that are often very dangerous. According to data from the UN Refugee Agency (UNHCR), there are now 65,3 million of people who left their home in the world. Recent evidence shows an increased risk of mental disorders among forced migrants and asylum seekers.

Background: Trauma-focused cognitive behavioral therapy (Tf-CBT) is efficacious for children and adolescents with posttraumatic stress symptoms (PTSS). Its effectiveness in clinical practice has still to be investigated.

Aims: To determine whether Tf-CBT is superior to waiting list (WL), and to investigate the predictors of treatment response.

Background: According to the working memory (WM) theory of eye movement desensitisation and reprocessing (EMDR), dual tasks that tax WM during memory recall reduce image vividness and emotionality of memory during future recalls when no dual task is carried out. There is some evidence that WM taxing also reduces vividness and emotionality of auditory or verbal imagery.

Background: In eye movement desensitization and reprocessing (EMDR), patients make eye movements (EM) while recalling traumatic memories. Making EM taxes working memory (WM), which leaves less resources available for imagery of the memory. This reduces memory vividness and emotionality during future recalls. WM theory predicts that individuals with small working memory capacities (WMCs) benefit more from low levels of taxing (i.e., slow EM) whereas individuals with large WMC benefit more from high levels of taxing (i.e., fast EM).