An abreaction is a negative emotional response that occasionally occurs during hypnosis. It can happen as a result of spontaneous regression.
Simply put, an abreaction is when someone gets upset during hypnosis.
Now a lot of hypnotists are scared of abreactions but they can be handled easily. Here are some guidelines…
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1) Set up a resource anchor, in advance. A resource anchor is a trigger for some powerfully positive emotion. If someone gets upset, you can trigger the positive emotion to help them.
2) Get your hypnotic subject to dissociate or move them to another scene in their mind.
Dissociation is watching an event happen from a distance, rather than reliving it first person. Alternatively, you can suggest that whatever they’re remembering fades away.