Here's a short video that explains exactly how.
For your convenience, I've also included the transcript below.
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if you have experienced something
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horrible and have developed
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psychological symptoms such as
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flashbacks fierce sadness or sleep
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problems you may well be helped by EMDR
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a proven and effective therapy suppose
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you have been confronted with a violent
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crime an accident you have been bitten
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by a dog or you have had to deal with
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sexual abuse or violence at home such a
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powerful experience is stored into your
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brain with a lot of emotions one such a
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memory is stored in your long-term
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memory it can bother you for quite a
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long time the disturbing memory keeps
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coming back and intentionally for
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example with feelings of powerlessness
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or believing you are not worthwhile EMDR
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therapy can help you get rid of these
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complaints and feelings at first and E&D
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our therapists will ask you to activate
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the memory of this disturbing experience
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from your long-term memory the memory is
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now stored in your short-term memory
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also called the working memory then the
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EMDR therapist will ask you to focus on
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this horrible events from there the
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therapist will move his fingers in front
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of your eyes rapidly back and forth and
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ask you to track his fingers as best and
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as fast as you can by keeping a
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traumatic memory in your mind and
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tracking the fingers of the therapist at
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the same time the working memory gets to
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process a lot of information at the same
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time as it is so much information the
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image becomes blurred and loses its
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emotional charge when the emotional
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charge of an image lessens it also
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becomes easier to think differently
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about the experience you will notice
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this because you feel less powerless or
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you feel worthwhile again the intrusions
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have gone and you feel less anxious you
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feel less depressed usually better and
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because you have managed to leave the
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experience behind you you start enjoying
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life and looking forward to the future
