There has been a recent growth in investigations into the neural mechanisms underlying the problems recalling specific autobiographical events that are a core feature of emotional disorders. In this review we provide the first synthesis of this literature, taking into account brain as well as cognitive mechanisms. We suggest that these problems are driven by idiosyncratic activation in areas of the brain associated with assigning salience and self-relevance to emotional memories. Other areas associated with inhibiting distraction and constructing vivid memory representations are also important. Each of these mechanisms may work independently or in concert with one another. Importantly, this interaction between mechanisms may differ between diagnostic and demographic groups such that similar problems in specificity may be characterised by different mechanisms. Given this challenge, neuroimaging may prove useful in identifying patient-specific biomarkers for interventions.
Autobiographical Memory SpecificityAutobiographical memories (AMs), defined as memories for personally experienced past events, offer examples of who we are and of failures and successes to be avoided or replicated. Some people, however, exhibit difficulty recalling specific events from their past (e.g., an occasion where they ate dinner with friends). When asked to retrieve a memory related to a cue (e.g., friend), they might instead retrieve general information (e.g., the idea of what a friend is). This tendency for reduced autobiographical memory specificity (rAMS) is one of the core cognitive mechanisms associated with emotional disorders such as depression [1-6] (Box 1 and Figure 1). rAMS is also a cognitive mechanism for which targeted interventions exist, and its amelioration through these interventions has been found to lead to an improvement in disorder symptoms [7][8][9][10]. Neuroscience research has begun to elucidate the neurobiology of specific autobiographical memory retrieval and its role amongst clinical groups who have difficulty retrieving specific memories. We provide the first synthesis of this literature. This review examines what we know about the neurobiology of autobiographical memory and memory specificity in particular. We consider what this means for why rAMS occurs and its role in emotional disorders, contrasting this neuroscience evidence with cognitive models of rAMS. We also consider what these advances in neuroscience mean for interventions seeking to improve memory specificity or to treat emotional disorders.
The Biological Architecture of Autobiographical MemoryResearchers have identified a network of brain regions across the prefrontal cortex, medial temporal lobe (MTL), limbic system, and occipital lobe that is associated with the retrieval (see Glossary) and re-experiencing of AMs, irrespective of their specificity [11][12][13], but which might be differentially activated as a function of specificity (Figure 2, Key Figure). In particular, activity in lateral portions of the prefrontal cortex (PFC) has been as...