Date of Award
Master of Arts (AM/MA)
Recent work has identified a Parietal Memory Network (PMN), which exhibits regular patterns of activation during memory encoding and retrieval. Among these characteristic patterns, this network displays a strong “retrieval success” effect, showing greater activation for correctlyremembered studied items (hits) compared to correctly-rejected novel items (CRs). To date, most relevant studies have used short retention intervals. Here, we ask if the retrieval success effect seen in the PMN would remain consistent over a delay. Twenty participants underwent fMRI while encoding and recognizing scenes. Greater activity for hits than for correctly-rejected lures within PMN regions was observed after a short delay (~10 min), replicating prior reports. However, after a long retention interval (~48 hours), the network showed an attenuated (but still present) retrieval success effect, with the disparity driven primarily by attenuated activation for hits (i.e., correctly-rejected lures exhibited little to no activity at both delays). Importantly, this difference cannot be entirely explained by a decrease in participant confidence after the delay. These findings suggest a degree of temporal constraint on experiences with stimuli that elicit activation in the PMN.
Chair and Committee
Ian Dobbins, Steve Petersen
Anderson, Nathan, "The Impact of Delay on Retrieval Success in the Parietal Memory Network" (2017). Arts & Sciences Electronic Theses and Dissertations. 1175.