Measuring Neural Correlates of Long-Term Memory Recollection through EEG

In the present study, we plan to examine the neural correlates of the conscious recollection of long-term memories (LTM). This process is defined as the retrieval of qualitative or associative information during recognition, and a wealth of studies have shown it is dissociable from "familiarity", which is a strength-based type of recognition. However, fewer studies have focused on whether the cognitive and/or neural basis of recollection differs as a function of the type of association that is retrieved. We take up this question in the present study and hypothesize that the electroencephalographic (EEG) activity and event-related potentials (ERPs) associated with recollection following item-feature vs. item-item associative encoding differs. Following the performance of two mental imagery encoding tasks (separation imagery and interactive imagery), designed to promote dissociable levels of recollection of item-feature vs. item-item, respectively, yet comparable levels of item recollection, we will record EEG while participants perform a recognition memory task sensitive to the contribution of recollection or familiarity. This will permit us to investigate whether the specific ERP associated with recollection, the "P600 old/new effect", differs as a function of encoded association. We will examine whether overall oscillatory activity differs as well. of the brain that occurs during item recollection. Overall, we believe that our results will help inform neurocognitive models of recognition LTM.