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OSDD-1b, or other specified dissociative disorder type 1b, is one of five diagnostic labels clinically recognized to cause a system, along with DID, OSDD-1, OSDD-1a and UDD. It is a sub-type of Other Specified Dissociative Disorder type 1, where the members of the system are differentiated from each other but do not experience amnesia of events between the members[1]. They may, however, experience emotional amnesia - remembering the event that happened, but not the associated emotion[2][3]. Due to being fairly differentiated, the different members of the system may also have different emotional attachments to events due to simply having different personalities.

Due to the way the disorder functions, systems with OSDD-1b may have a difficult time coping with their trauma because they cannot subconsciously escape from knowledge of it like those with DID and OSDD-1a can. They may also struggle with accepting their system because not losing memory makes them feel like they're always the same person, or not losing memory can make it feel like their system is out of control[4].

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