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Definition
Fragmentation of memory is a type of memory disruption pertaining to the flaws or irregularities in sequences of memories, "coherence, and content” in the narrative or story of the event. During a traumatic experience, memories can be encoded irregularly which creates imperfections in the memory. It is also described as a memory that has been jumbled, confused, or repeated unnecessarily.

Causes
Memories of trauma are often fragmented because these memories aren't usually put together properly. Instead, they include intense emotions, sensations, and perceptions. Memories of traumatic events can eventually be constructed into a narrative but usually remain fragmented. In peri-traumatic dissociation, where individuals separate memories from their emotional experiences, there is a “data-driven” processing style and “conceptually driven” processing occurs less. This leads to fragmentation of memory relating to the events of the trauma, meaning that the individual encoded the trauma based on facts of what they saw but they are missing the structure that pieces this together into one synthesized memory. Fragmentation of memory is claimed to happen in posttraumatic stress disorder victims often. During the traumatic event, dissociation occurs and this leads to irregularities in the encoding process. This then leads to lapses in the memory and therefore fragmentation of memory. Therefore, it is important to understand fragmentation of memory in order to treat posttraumatic stress disorder.

Experimentation
Most experiments involving memory fragmentation have been based on empirical studies where individuals were asked to recall memories. These individuals were asked to recall a traumatic event and explain their memories of the event. Their responses were then analysed for “cohesiveness and semantic structure”. While experimentation has found results relating to fragmentation of memory, these findings aren't always very clear or conclusive because there are limitations regarding the methods used in experiments. These can be attributed to examples such as the fact that there isn't a definite way to test for posttraumatic stress disorder.

Dissociation and Fragmentation of Memory
Dissociation has been linked to fragmentation of memory. Dissociation of traumatic events is often associated with fragmentation of memory. After a traumatic event, people often dissociate from the experience by separating memories from the emotions involved. In peri-traumatic dissociation, the memory of the trauma is fragmented because of how the information is encoded. It is encoded with mostly a "data-driven" processing style and less of a "conceptually driven" processing style. This means that the data of the surroundings are encoded, such as the details of the individual's surroundings but many of the more complex and conceptual information isn't properly encoded in the memory.

These two terms are commonly used together but it is also stated that a solid review of the findings for this link has not yet been completed.